Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc794cd1d58e13b2…

MALICIOUS

PDF

94.3 KB Created: 2021-07-01 11:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e7e2b0593260c5eb2f6dc283a8ff326f SHA-1: 741e3f89c797d00946cf4a94860e10c8bc48e120 SHA-256: fc794cd1d58e13b228d856a6c36ca9a0de70af1ed45231f6d926bdd6ceb08f96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • 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.
  • 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://ccswcd.com/userfiles/file/tofopak.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3b584ae89---73489013594.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/xireneful.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/lexaweba.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8f1f09ef1370343b9edbc8bcff057b96/vevezoveridipusegow.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/t72v7mb2q6oiai2n23i1306af3bfv7pb/29626376533.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/lnie6s41euu2gldldk59i2tdeg/27791143593.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609025b223bff---18897143147.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609224c2e240a---19411729954.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/5h7ae1p9o4disloo2k297hks9j/93037995213.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/33316bd51c6ee2a495200cdd78be4ee4/dexesanulosesirusepu.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106110854453686.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/8tbjlsbqdpps9kfdchbjlp6p66/dafop.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/tanabusezuto.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/30528761483.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/d2a480e0d1244e87ecbd384314944854/77533256424.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d6dd8e040173a0b2ffb499d28a247626/dediser.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c4e942e43---40396638800.pdfIn PDF document text
    • http://boxethai38.com/upload/file/79443587578.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846a0e8ce1b---dulurobuvavaludezumi.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/6155190437.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/891dd2041adf77d1d76c1c74a4efcee5/pebewagutot.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/95170906851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=finding+possible+values+of+random+variablePDF 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
font_00_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A11 19012 bytes
SHA-256: b6584531522083eac60c2aadee78afdcdf2650e0093cbe1bcd95b9cf96954f76
font_02_sfnt_off00013cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF8 11024 bytes
SHA-256: 71033bddfe68f65bf9ff77b4dc4f12cdac1768977fbd5a34fa071b43d6f807f4
font_03_sfnt_off00015614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15614 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7

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