Malicious PDF — malware analysis report

Static analysis result for SHA-256 199619700f846423…

MALICIOUS

PDF

73.5 KB Created: 2021-06-18 13:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa1e65666247e15c188eef02b4ce4dee SHA-1: ec958017957d03b292f92f5be6d120cb151376e6 SHA-256: 199619700f846423f8a17ab60fb9ea864a95c286be3ab8d0cf5d856cb06f8ae4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the presence of numerous links and the 'link farm' heuristic suggest the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a119852ee31---nekarovafuvekilibaloben.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080a78c55434---rukipoza.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/zadutapogow.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29024f4076---29391181566.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/kezuresefadidisalo.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/6s6vf6bnkgiukkvm1ht9bts8cl/fotuxuvanubep.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/725cae5e956b91d4a7496b9348d42551/mutugerolonob.pdf
    • http://stphilomenaonline.org/userfiles/file/29724918219.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/0f91463bf1b558f5bde76e50512966f9/pesevovizanorulafunesa.pdf
    • http://zulassungsservice4you.de/bilder/file/tebusefopifobipejali.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3fa81vemk5n26451l6opselq46/55787189808.pdf
    • http://nowyhotelik.pl/userfiles/file/30391886624.pdf
    • https://adepotcustom.com/UploadFiles/file/20210510060451186.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/re50plakgb8943ibik7v0ssuo5/3056959876.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a0d55fbd6---75714813108.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+complete+the+prison+break+heist
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e752.bin
eba870ed8e62dd2c0bd244fa5a21913f6e3e85b3f7930ca6570d6afa6ca5262d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 5428 bytes
font_01_sfnt_off0000f9a2.bin
57eb58f2aa9f02f73f22ccef735a0a57f014dd437bd8892860b54066ff9b49fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 11156 bytes

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