Malicious PDF — malware analysis report

Static analysis result for SHA-256 f192cf9fdb35fd09…

MALICIOUS

PDF

70.8 KB Created: 2021-09-09 04:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8a78172da4799a7f2957f3752d650f9d SHA-1: a5ed15cd38e93961fb24ece8196e8bbf63b8faed SHA-256: f192cf9fdb35fd0990b47ec5f1981199d61a676029bad4948293c2151efda7dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the URLs as a link farm on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://uniontsg96.ru/admin/ckfinder/userfiles/files/wadoruwimekajuvagax.pdf In PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/gafaposizimazavi.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/8116365482.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161385c9ece103---4968797774.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/44880210572.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/35384447315.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/jukag.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/tojidinamuruma.pdfIn PDF document text
    • http://iltorg.ru/upload/file/52137351845.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/62222078742.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/68048767307.pdfIn PDF document text
    • https://aromamarketing.md/img/files/50032550937.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/33326673505.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/10324457887.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210909_2D3F3DB9ADBC038E.pdfIn PDF document text
    • http://vitrine-prof.com/files/93642355296.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341c5a8cf04---53099231075.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395d54a5c91---86540831465.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/xorixasamital.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/jevezunixipozodomaw.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/34059808292.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/simutof.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f3d6e0932e4b140ff34ab6a18b6487b4/vobewupofazute.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/vujuboxanigotegaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fap+ninja+androidPDF 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_off0000b7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F9 15564 bytes
SHA-256: 3c30f2294dcff5d4abee5ce861c75ef024680ec4564b45d95cd3ba62582cf957
font_01_sfnt_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 10048 bytes
SHA-256: 1e98e661bb9e253930dc24a10942cb923f49e3e35935a2170e73676dcd99fea2