Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2b936497c837e1…

MALICIOUS

PDF

79.9 KB Created: 2021-09-21 03:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec013a12661ab0c3a1419b651a998843 SHA-1: 5518491ae34a168c87d956b3cc4cc88441202dce SHA-256: dd2b936497c837e1759eb86672e534fa5e2f14a8bc326d3be5702e5051b099ec
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to redirect users. Heuristics indicate it's a link farm and a callback phishing lure, suggesting an attempt to trick users into visiting malicious sites or initiating contact. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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://huntic.ru/uplcv?utm_term=most+secure+mobile+os PDF link annotation
    • http://thongthien.vn/upload/files/nodex.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/19923862602.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/86982659465.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/natibazixofe.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/b1up2qt7ldg02ssdhp27c4d8q5/40023741257.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/latutugomofexavojifu.pdfIn PDF document text
    • http://szwygs.com/upload/mavutikogekozo.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/41169457835.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/49190009634.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16140309353647---66144320282.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/bavik.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/99131755195.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/kefejuwogotag.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dfac71ffa---surotedutawaxalifes.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/vawibaxiwelidagiga.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/52880794044.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/55896721710.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/44393961351.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/sotifigudavuw.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/ketulefanusobenujuto.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/wufum.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/vogotur.pdfIn PDF document text
    • http://househouse.it/userfiles/files/xomuxudidome.pdfIn PDF document text
    • 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_off0000d55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 10360 bytes
SHA-256: 66ed44fcbc3a06112f40472a3eba64e1ac77cf66c756624ac2bb019a3a2a95b4
font_02_sfnt_off000104e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 17368 bytes
SHA-256: 15c4a9bf8517513947a2dba6323fc1966619dadea7381727e5924b5f22468ed4

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