Malicious PDF — malware analysis report

Static analysis result for SHA-256 462eb028de21cc09…

MALICIOUS

PDF

135.3 KB Created: 2021-06-25 22:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5cad1440473e9efc3240d6f0e7145b84 SHA-1: 3802ce4f0bb8aff213fd334433d051fae5d9d819 SHA-256: 462eb028de21cc09b1f45bd5052d91bee4d5bd1047e2932f70e5c01ee7df4984
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous links to compromised WordPress upload storage and disposable hosting suggests an attempt to host malicious content or redirect users. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number for fake support or billing issues, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9752

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 http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/seron.pdf In PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/sifod.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/1decad7e856d7c7a88e09a060509b299/nexuwalikigipabelulak.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/xutijuwudevezif.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/godawiwok.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/9088e39a297a57abe976431d73324ce3/jexilelumaju.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/gk21713lh5tpmh9kfb9b8buhp5/jewunom.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160841374e631a---26862681162.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789e9c6c4f5---nemapasumigipugu.pdfIn PDF document text
    • https://ecoretras.com/file/87039213259.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lamiralapaxuvojip.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7icaj0jfauo3sircvem1neuj0h/lazozeduferefevukum.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc6141beec---gofedevenebodode.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/v725hfoblea9v2rmsgdb7v9aua/43918032075.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c646565c05a---3336143975.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/3674908032.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6f868ea2e---59912523375.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/41676140065.pdfIn PDF document text
    • http://ibb-online.ru/f/file/natabumi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0e8b55376---79126436207.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/sifodakekuzo.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/12532674aeaea403efaed0093699f725/32066032414.pdfIn PDF document text
    • https://nasikampung.info/contents//files/66846825474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=physics+table+of+elementsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001f449.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1F449 17708 bytes
SHA-256: ce403be14acd5c992d36e6cba4ab9ac5376d5194b3e24a3827a8845b61eeaff5
font_00_sfnt_off00018752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18752 23052 bytes
SHA-256: 6447b21406d0ad85d4e35c381bb711fa5de2d0cfd3c930eac905eea00f9913ae
font_01_sfnt_off0001c39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C39C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001dbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBB3 10756 bytes
SHA-256: d12a9dacec6385d3422f095c46dc7334ed6de3b80b1bfef3a6ff5d5dff8c9566

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