Malicious PDF — malware analysis report

Static analysis result for SHA-256 634fc1f5385278a1…

MALICIOUS

PDF

86.8 KB Created: 2021-09-02 21:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2107b2b38cefb0abe5f56ec036af0be0 SHA-1: f34a7754062c21ea827ca15e01fda2c5212eb3f3 SHA-256: 634fc1f5385278a11edefbab42d363a77dbd58e08b8fa8d112e12d25f5d22915
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to obscure the ultimate destination or host malicious content. The ML classifier also strongly flagged this PDF as malicious, aligning with the ClamAV detection of 'Pdf.Phishing.Trojan'. No scripts were extracted from this sample, but the presence of multiple external URLs and the nature of the heuristics point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=protocolo+de+estambul+pdf+2019 PDF link annotation
    • http://speckrepej.com/upload/file/99313129873.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/pebusofaritamotiseja.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c48f31172053cf579f07651fd4a07f86/39719407957.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/mt09dgl0fe3v2lhjakdvp2htg3/kenozejidupijezob.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/zisevuvopibeduxisefu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c27109103e00ee63b3a7f327a26dcb0/vumapogigo.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/tozexibagajafevafitisugum.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160810441c6f29---37959325185.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/86928889935.pdfIn PDF document text
    • http://eichler-kammerer.de/runimisifimenug.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e97721aa07---wurobefovadejenagenu.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/40419429226.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/pepola.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607194c6765cc---12656615119.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/82e7465c7f502beebd415020d236ca44/43855620259.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/faruxokolotivuki.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/23309439044.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/3258689135.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/nikamavijapigovowevofa.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47d1e30c5c---16870831491.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/96322136485.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123a4978f561---madudupajezoba.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_off0000e6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BB 19816 bytes
SHA-256: 2e1b42e86dcd4651da6eae0cefe647721fe18d96699fa3e32ce48cef57a48210
font_01_sfnt_off00011973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001318a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318A 11288 bytes
SHA-256: c1623d7ac08cf21702f4f4505b1ab6d808c054524188fc28580582bb640c2f35

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