Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7b350499a8abfa…

MALICIOUS

PDF

114.2 KB Created: 2021-09-06 20:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8794acc2c8aec12df8cebb982d553428 SHA-1: dd9109ccc37d669d797a4f7dd5bef8c4f010d2ab SHA-256: ab7b350499a8abfa700897a8fb8c37f207f0675a7eb1a99bd96f06c254985897
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were directly extracted, the presence of multiple PDF URI heuristics and the ML classifier's high confidence score suggest malicious intent, likely involving the download or redirection to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://condicionamentofisico.com/arquivos/file/62817251411.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca7fa687e2---52540131042.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081523f54d1c---bopogifeb.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/66264000195.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/40001307741.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/69665438790.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160733f0388f5e---lowerina.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9d66014f3---19417153010.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160785448bdb25---gapeke.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/logemotisadibu.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ae0385dc1---tazalox.pdfPDF link annotation
    • https://penmypoem.com/new/admin/uploadfiles/file/34496696960.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/hhr0ttk0gk4gr38uvcg5dj7k34/25122146960.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/dpk5r8unct69nssll0tfclr5hj/naxubaredalarafibe.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/teneniwafomoz.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca973c05d7---38974162642.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/lobijenumevemipavefab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05e8e8d8c5---sesopesikok.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/78485e958c909e8122ab2286f090d3b2/86280149770.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/46981867254.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cf3a633e1---xasigemifefalonam.pdfIn PDF document text
    • http://htwy.com/upload/file/rabonisowemebidoketutari.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/s55t5qms2m5okiflva68os57b2/gujizepam.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/02c0abff1325cf635b615dfe927c8e7b/94147337860.pdfIn PDF document text
    • https://menu2uplus.com/images/file/58633321650.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/62886010907.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e5b0b3a94afab115dce5728b1c63b5f5/jimigupapeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=barbulescu+contra+romaniei+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000152b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B2 21144 bytes
SHA-256: 7ca63e0439b315a6221fcb1907387806e6451f15119540bcca7f766d55e6caa5
font_01_sfnt_off000188e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0FE 11072 bytes
SHA-256: 27ad1fe4574cf9f093022ad59a8d86729cb3f887523265b8ce09b7b06e147c56

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