Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bf560904733754…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 22:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85ec66ea559a054710527985cb5e338b SHA-1: a181c1786edec168bb849e61ed995a9586ee764f SHA-256: 85bf56090473375468c929c43e603252afaa08569510b33d76219c9b001dbda1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document acting as a link farm, directing users to potentially compromised WordPress uploads and an IP address. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/60e4f7ceb66970b42aa2d35dc7e29fd9/57062608.pdf In PDF document text
    • http://lycee-elm.org/userfiles/file/ziposobokotadawimu.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/7a638b2333938f9e5329fef40e00d9dd/50706800082.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608338676e4c4---fonitapuwiz.pdfIn PDF document text
    • https://tmtteks.com/files/xepenorixego.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/519747a2df5ab467425671b5bbed3844/89778001565.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/32800878811.pdfPDF link annotation
    • http://onlineexpert.in/userfiles/file/tetarenulekipelafolifejeb.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/fidarukes.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/melido.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611adc5c4396c---wazabotuvomufoxun.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/299a556d1d8351a0ef092a7e6ef7d87a/dixupenofotanonowitevit.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/8470956013.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b58361701a0---xowutagevo.pdfIn PDF document text
    • https://equinox-e.com/upload/files/23852036502.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/perijatelopivexopoterulin.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/77f128e08044480333f193a60a813a68/34824980899.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/97956118398.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/5940826132.pdfIn PDF document text
    • http://stavbyhes.cz/ckfinder/userfiles/files/72098960989.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/70140714996.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/15654908482.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/d409bbc71f83eb5a604f90563e5400de/62406779593.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/100af228da52ca45600a656acf351e22/bibano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=acgih+2018+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_off0000c868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC868 22848 bytes
SHA-256: f8e7411ba8e05766e599ae28d2344dc2de1e4704466df40caf0f2a9f564e1fb1
font_01_sfnt_off00010102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11919 10452 bytes
SHA-256: 273096795ca349d14e9e1f001d2516659a3568ea3d04b1602f83890b0d384558

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