Malicious PDF — malware analysis report

Static analysis result for SHA-256 639998f32ab54e6b…

MALICIOUS

PDF

102.4 KB Created: 2021-09-07 18:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 08eebe3fedf89b2bf1651ccfdc14073e SHA-1: 497306b33dcbef29a3e717a1069a85f5f2c29382 SHA-256: 639998f32ab54e6b00d7a28ddf9321b17047f34dc47f081d1bd8e195529b06ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the true destination. ClamAV detected this file as a phishing trojan. The ML classifier also strongly flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd1344920f---63536458211.pdf In PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/teuc17sqrdb7heoostddniv5bb/70439270222.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/lixivetaxewenikez.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/1rcilk8bfmb5pph22q8l35c0hb/pirenix.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/sajixojetuxawabef.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/45187138937.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16076c4eca040a---bizimoxaxenuges.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/s78ailitqv9g0n8cnlbpvutfgg/44612625393.pdfIn PDF document text
    • http://santeh.md/img/files/jisugafojidug.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/87080683862.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/pslifnji4u0h3dhm83lnbhr08f/59729353730.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/24380857642.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/lavibaxemijorufemafuxo.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/84187767558.pdfIn PDF document text
    • http://bjjiffy.com/upload/kipipaxanupigiriduborerap.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57da1c888d80c095c941f2bd90599567/zemaxoweb.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/36159794481.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/55382505737.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ccf49a3c19---89284492896.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cde5514d9---57088475240.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/xugamivimipafize.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/32282318373.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/517cafa4a9b6ef14a472a53bfe157e6c/sigupiropifurenaneni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=s+bahn+netz+m%C3%BCnchen+2018+pdfPDF 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_off0001222c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222C 21116 bytes
SHA-256: a9f23281a966c38a56e3bd55b33c2c2e9ad63f17e85cdeb593ee7e9ca2c0e9cf
font_01_sfnt_off000157cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157CC 11328 bytes
SHA-256: e72d8af0885f7a1b83e4c3eea05a046177a515b58d536960f8d76b75fe7486c9
font_02_sfnt_off0001721b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1721B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1