Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f41f29fb4629088…

MALICIOUS

PDF

92.8 KB Created: 2021-06-28 15:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d3ba1f36862558085de43395833ffd02 SHA-1: bf74861d48c06bdd5254da597a36fe076fb88a00 SHA-256: 5f41f29fb4629088f56ea9eea306396190e647826c1fb2388d10ebb6b0e539ac
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and link farms suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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) or Microsoft license-boilerplate 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://medvor.ru/uplcv?utm_term=hollow+cylinder+has+a+charge+q+coulomb+within+it PDF link annotation
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/146006abcd44d511d1b80d3bb1f74835/ketupidid.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/918967ca4ab0d4a739ab3a959cd6e750/86632579749.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/52708485529.pdfIn PDF document text
    • https://peterdegendt.be/file/dofulunujewutekitiji.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/zufaxesitubikase.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5111b9633---pafibovodasawipo.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160893a5ea6b79---87150615905.pdfIn PDF document text
    • http://fotossc.pl/_files/file/71727131553.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6fcb08ed0---92702265017.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/gj64i8quqdtiq0tn3ev0pt6usq/wetexoronalujoredagawefer.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/katit.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/91372097099.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/40831616add3d6e05ed4072f0f4b005e/96148837715.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608213af1529c---kigewusupafovorin.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b299817acde---73271127530.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4b490f8811d5f5cc3add156e6c72924/segov.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/69030170357fccab8b26aadc07cae20e/tiwasavugivixesomonigikub.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/87107823081.pdfIn PDF document text
    • https://eurocomm-italia.com/file/kivamukagebavis.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/98f90b2099b8898da16d592045a9854f/5926141586.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7ad8f4d2a3dbf5338b8f021dbd986a9a/94590417137.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609fffdbe5673---29943457777.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/xufowize.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/29498905015.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/lepekodivisofawu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_02_sfnt_off00011a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A83 11396 bytes
SHA-256: 176f594b267192e778c53b056880dbec03efdd4590d53dce8562e50c3363fa1c
font_03_sfnt_off000134af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AF 17688 bytes
SHA-256: 85bea9e9849fd162ca9fb3f2cb03fac7b2ffa7ce8259c00b7d9703215919424a

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