Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91f338aba4de3df…

MALICIOUS

PDF

87.1 KB Created: 2021-07-19 15:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c7e645925182d972dd2f35bb8c83263 SHA-1: f35905c52cae1d443cb4b6acf42ad45732b1ce1e SHA-256: c91f338aba4de3df90cbd5942911389a5c9cb388a53cc5cdb341cb74f052c693
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious content delivery mechanism. It contains an embedded JavaScript stream and a link farm pointing to multiple compromised WordPress sites, likely serving as a lure to download further malware or redirect to phishing pages. The presence of JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://adamlegal.com/userfiles/file/85656495235.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6d989fb695a218dbcf95a9d3d72e0923/73950836932.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cf95554e---57907517295.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/564918744f4e2b260272ec2244ea4f75/96773804346.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fsbbf1e533nhvime8lkvbn1lc4/rimutelomikirek.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/57270691735.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/30145737166.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d528fd21ae---5073203977.pdfIn PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/fujizul.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783b74f1383---27601453847.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/lusiduxefobuvipimejimat.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160715eb4bc3dc---24273608209.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///mawatamawavasiwirew.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/konodetew.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/22507289464.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/dimudekigivepe.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb729dc8699---tikalomududurir.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705ae267ca8---jalovaziga.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/87152410495.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/203b1aea3442be1344ca7f0875f124ae/15075757293.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/bokoli.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e86fd1db3---85877623037.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1b2f154dcc023c4947938eb403c9948a/22460047118.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c3fb7e4a166c0ff0710954d3e257509c/suwolixofifazo.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/6202950459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gta+5+map+with+city+namesPDF 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_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 10748 bytes
SHA-256: 1c72515b1c5f5566dfac8878213827dc4efca5b7c5a2993ccf86b24619ee7b41
font_01_sfnt_off00010a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12279 17292 bytes
SHA-256: e0fd8cf2b2fb4d4a5a646a926a979f649727a056ebf8e143ba76b381b72cbe63

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