Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc54fbfd49785c1…

MALICIOUS

PDF

82.4 KB Created: 2021-07-30 20:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf7c7e1a899e84edafa2a347b106b99d SHA-1: 088dabec86d684eef7eaf995c01dab304edc6f37 SHA-256: cfc54fbfd49785c16fc1acdf86c6982f0d15f68b17e08df0f7d2b90a411772e1
176 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content. The document's structure and heuristic firings indicate it is designed as a callback phishing lure, prompting users to call a phone number under the guise of a billing or security issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://alexanderkanevskyartgallery.com/clientMedia/file/22188935519.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16075e88837567---46385650342.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf46a21743---kamenupidetoxabij.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8bb550499acaa20b97aa5b26a7503f23/getidafonapotagi.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/13278092374.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/fazumes.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/70871728867.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/842495373939f88360b7895984252ce1/15741578570.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/60751179bb409c10a368be5cf3affdbe/66468369675.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/zixomenanosuges.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/vosupofotenetamuf.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/e84rpojgssh02ltce6omjir10k/nedewaxerelaw.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5f6c2437---93600531427.pdfIn PDF document text
    • http://museeducuir.org/upload/files/davamir.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/rtsijjuakf22f7denjbb4dk974/tujawikux.pdfIn PDF document text
    • http://iworking.vn/uploads/files/19358267274.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/216d92fbe987bf99b3009b5bea4fdb30/44201492369.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d705039819---xifebuterixuju.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608df9872862f---xanapasinorelabe.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/jarekaregaxexetu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2098b44f0---88658505390.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/getibuvuwewogakis.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/b223c817034b8d77d2456f17cb4b8c70/biduliwegonojera.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4u626c8a0n29v493dco8gcqm29/69822301690.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/81945028879.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/22241137141.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5fca2ebfd---mukukiluvufov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+7th+grade+sciencePDF 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_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 10524 bytes
SHA-256: 50dbad9928b1cb9db06f92f35ca7d8baf3901e8af71743dd4b2a668efa16afeb
font_02_sfnt_off00010d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 16828 bytes
SHA-256: 4b83d534dabb5c75e30f1ef0a9f79bb63724db08f27c86cbfe645244b86a8860

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