Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d488cdb861bac9…

MALICIOUS

PDF

108.3 KB Created: 2021-06-28 03:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8b381a492e6218ce8a32891c1e93e614 SHA-1: 5aa912175a60289d6d5617e8390c323ade6dc76e SHA-256: c1d488cdb861bac90917634941023d6c26379065535e9563c63401cda52c1d64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=kant+hypothetical+imperative PDF link annotation
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b0f91a753---xawefofigudibutub.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nenexejiverawor.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/7e26c4eefdd240244be6b687ff0de284/jafuziseveva.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d981bc28ad---49724187800.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/kusakonutuworisonozobe.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/d4ckm5acjdg9ntjf6p8hgvjkj2/sixosison.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/12808014416.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/direfesizafaf.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077d85810ed4---bexesogopepoma.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/257611b17a80f7ab319fbd21df08b152/43057384241.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/kokowiwawoburinerigelab.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892988908fc---xawerix.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/t0td0lseecusdh9pfflh77a467/zewiwewif.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69f8a7adbb---4420958271.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b822837d---53869792880.pdfIn PDF document text
    • http://capital96.com/userfiles/file/95928279514.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/cfe708b6a2e6d6ddf3469dc523a37779/dikaloxasilik.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a279308be---27428384617.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/97147988740.pdfIn PDF document text
    • http://katachizu.com/img/news/files/16779647408.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/60322462994.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160835e9313548---kodifibel.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/79325638041.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/b57e1f3c0447518f7f67aea428a7c821/gebeta.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2661677b5d---44640859272.pdfIn PDF document text
    • 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_off00014081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14081 21044 bytes
SHA-256: 3109d7db3564d17c916d043c6bd1e8f4fafcdfe911858dc9c32efdd72d29ae1e
font_01_sfnt_off000173d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173D7 10640 bytes
SHA-256: bf042f9d724399dee306b22e68e83948f9c818146390d24d28ca372cb9b3b526
font_02_sfnt_off00018bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1