Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8b1ce541a8935c…

MALICIOUS

PDF

84.5 KB Created: 2021-07-06 03:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d0d3159ebecbb34f3ddb1cbed0fdaa1e SHA-1: 717aaa4b1f37c13235e7cdafe8b7fbef1b8cc9e2 SHA-256: 5c8b1ce541a8935cd9e63026d25cae36ceec3efe7e266c7c3578f003cef3de81
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, further supported by the ML classifier and ClamAV detection. While no scripts were explicitly extracted, the nature of the links and the heuristics strongly suggest the document's purpose is to trick users into visiting malicious URLs, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ee1a2cebbd031f2e0abd367331ac31b9/61522504045.pdf In PDF document text
    • http://synthecinter.com/userfiles/files/89174319242.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607356d8945ec---bugepuzupotesub.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/lawir.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/27065546468.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/kofedetikutop.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/nujirurivinisavapuv.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/r7ssk2p8ld58lppdh93gaqvodh/23015815961.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/i2mi7f0e8f9feimuv82otsbtvg/88693484222.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/376d747316c1ec8e047c3b207cd86d7d/10539282758.pdfIn PDF document text
    • https://kede.org/userfiles/file/56546246822.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/sonl3tqu4lev1rvf0a474vstku/28239115786.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/j8aelr4vbbum6pk3kgmlrntmb4/felatekeredunoze.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210606120625.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/88450797897.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a71334507---tivemo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/tioev0lbh3nfl2fr4boa205sn7/99420865767.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/543623f78b081ca181e8c68461e7e869/jekitanapu.pdfIn PDF document text
    • http://jp-cable.com/d/files/79586367124.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e4b6538c6e352ba7924515d189d194be/vuwusoxeponoxevaxe.pdfIn PDF document text
    • http://cloverdiamond.com/file/ruxubowewagosu.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/wepepixewekumux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=why+is+water+a+polar+moleculePDF 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_off0000e65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65C 17300 bytes
SHA-256: 0ee616ba1f19c26a5a5c555dd9fddc6fea590f017c730e9a860ce99c326a6848
font_01_sfnt_off000113b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B0 10828 bytes
SHA-256: 08d7508fefbbf5a2d7a2a5acd77bfdd08703164b12ba2cbc148d4a7db3fbc93d
font_02_sfnt_off00012cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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