Malicious PDF — malware analysis report

Static analysis result for SHA-256 80faf88aaffa0b1c…

MALICIOUS

PDF

69.9 KB Created: 2021-05-06 21:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89b58898c4f38949161fd0a817fa4f33 SHA-1: 5bfba7a542f32116931bf992d5b0a0bfef412add SHA-256: 80faf88aaffa0b1c9d726b5baf7e043a116f2f4f208773978689549d0375e55a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and contains what appears to be metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160878b995a9b0---64140501731.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/1970a65cce5f18d41a8cd234d09e8143/xanerilibupudetuvo.pdf
    • https://acgroupenterprise.com/userfiles/file/fejemadebutomenamirenurad.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078df7b68e70---11357077082.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090e3035a60f---rukepuvisivesoli.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e1478234---rurakimugepuxojuzifa.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/48247406a118845d9fb8d11e9567855a/93343273857.pdf
    • http://acecaalcoy.com/userfiles/file/46250499212.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd04ad777f---pejuvuwalowetofugitaso.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a018242b6---83763556652.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092dca4d17ac---mirajexazikiwurawoloj.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dbe284c1b---lokorupuxopukirepejajin.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160729d8f9eaae---85889050456.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7a3492b0f6d6afcd2d06e919e6970d6a/65915850717.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99a2561a5---rugatixufivifogakujufek.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3fmm6jhp9jfv4lm98u9bo1pse2/mugite.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5c1105758---kanumudupopuvifa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=annamalai+full+video+songs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3c0.bin
bdc81bc9db1e25bfb5492387d75fffabfa469a1e05ac2be82ca286a3893a407e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C0 5180 bytes
font_01_sfnt_off0000e562.bin
533ffbb547e15ac4ef14390ee651c101e9048a2ab6728407beedd0dfd7308910
pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 10668 bytes