Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9cf9f29beca4a5…

MALICIOUS

PDF

85.0 KB Created: 2021-09-08 06:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb6d59873727433817936e55fc7af56d SHA-1: d10a855b2fec6e24f66b1f80bce2bd9392609c6c SHA-256: ea9cf9f29beca4a5ca70384d4bdae97b3d77e256441ae13d215bc81602341fec
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm on potentially compromised or disposable hosting, and a callback lure suggesting a tech-support scam or phishing attempt. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to trick users into initiating contact with an attacker.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106152057211316.pdf In PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/kipirumusitukunisoweja.pdfIn PDF document text
    • http://sy-smile.com/upload/files/41144674411.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/22def65b9b274d3d9ce125f34829ded1/xevivotesupezerewelo.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021791248277241.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/1da0a06d59d3619d86401148fc87fd04/javixuvotirug.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a26da2bea3e8d905b727c79ad4d7b5d3/bamavavarujuwedejeg.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/68228538327.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04d6d57a13---nejafoweleru.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612a6c3c16bb8---33074878257.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/45408186195.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa3a2462b94e251af8f166546a6adae9/7280249225.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7889b5ea50---fekunilukunibavo.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/powidolizavak.pdfIn PDF document text
    • https://bnovum.hu/downloads/relibofafobikawo.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/kda5kfregp174dv4jkru57f8uh/pewonugebulamiviroxolafu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f3e156e0f7bb1f7ebefb35e877ca2785/runivevuxelelaxawitevew.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/0c0600c6e0a6d3fae4396387fea32e4e/palesiko.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/5v4ft1j77ros051rqubph8dnv0/52045786902.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/563fadv3oba7m7mjudu0k9k89p/33337254013.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/pijovimikazinepa.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cfbc180b6---3247123564.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/57346011584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=iphone+5s+schematic+diagram+pdf+downloadPDF 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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 18416 bytes
SHA-256: 8e266707388b2b111332e9106e8e363abf7cc3d1221c12bbc7c610dd91038fab
font_02_sfnt_off00012c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C37 11236 bytes
SHA-256: 05ea2868fe53c8c27943ed1120386932aba7c2cd52cef7418e32e88efa3f2656

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