Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba00dc1032cc4f0f…

MALICIOUS

PDF

78.0 KB Created: 2021-06-18 22:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ee5f813043f3c80145a850cd98768f51 SHA-1: 6ac82eead168bfb750686771b9c5c14b139c6ba4 SHA-256: ba00dc1032cc4f0f981c4e277d04343884170b5e0df77deb174908d6186ec404
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or to download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a distribution mechanism.

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 https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608541d8c9c47---71807865985.pdf In PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/9661c8440b5d8f0da5a29efaf8ae4d40/borazurone.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/253ac728e6baefb4191173534828f1a9/palakolurefed.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-8/20210508112300453230.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/t7pv1cae3aptv642v5g8pte5a2/biwosikodamasefaw.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vl3lse75n0o9ue619ln1rhe6ts/93577132153.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4b9044ca---97856442088.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/sefitetigafitezosevob.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/08bb0103d611c2547c6e9b0a2a952d08/50445330726.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/86834823528.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/dedowel.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/pewosenuru.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/db74c163b31c17ff9b008cfd15d1716e/79600687705.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ci7gut82l338dpuhskmnbperch/26030138267.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/riguwaxabutefuruzi.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/dcklud3mdc8l428e0usq4goa1o/14433787717.pdfIn PDF document text
    • https://triosms.com/userfiles/file/26342891678.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/wowunutije.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=daddy+sylvia+plathPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 5112 bytes
SHA-256: b0bb0d1e8b63faf22b2e880448f688c8660e3be0e21bf4a2fedbc0b82e99d644
font_01_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 10368 bytes
SHA-256: 5d26ec7f21ff078ac2bc94755f13bfc9eb9fe957b2706cb1c855066186c23044