Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91f32a29f847cf5…

MALICIOUS

PDF

71.2 KB Created: 2021-09-05 03:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 976aded2dc2e08c5e9808ff76b8114e7 SHA-1: 932130f4466dc8eda1227e2007be672ec7a89587 SHA-256: b91f32a29f847cf5852d6b419acb9b3384743c3a81b410da0125a7fbf3996b33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains multiple heuristics indicating it's a link farm pointing to compromised WordPress upload storage. The embedded URLs, particularly the one hosted on artmetinc.com, are likely used to host or redirect to malicious content, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b389a06931a---patuvesebirekufevid.pdf In PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/71864073900.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/91949911770.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/51592247918.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/nodab.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/gfs5ram74dj4v283n3903lci45/11866841822.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b36e8a0d6---ronuja.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/60363823481.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609271494c44c---nokiwidovofadume.pdfIn PDF document text
    • https://memoservicesrl.it/file/34980686535.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/metetanunuxipuko.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160abecbd3e0d1---jowapemupajakufit.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rc78clvs8qnd36fcob8hqcbs9v/rijifez.pdfIn PDF document text
    • http://peeweeslearningcenter.org/clients/5/54/545fcf94abc6bccf175f3035c740e6d3/File/84851004237.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ampecr9s8qeh0cft04gjt1ha47/62115903079.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/62729304184.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/tisuxokitunoka.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/gesobijefavotokaxomu.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/26328834583.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/94646196392.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210607134745.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a3f7a543---68154041722.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078c7f9c16a5---pewezikaxakutifimujalafaf.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f726220f75d2dca772a6b67a5295b99b/wonidatavolewivajuvit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=have+you+ever+seen+the+rain+guitar+tab+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_off0000b4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C2 11144 bytes
SHA-256: 3dffd0f44cc21435e7158fda104b1a99a3724d4aea7cf41456a7f43b9035e11a
font_01_sfnt_off0000ce4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4E 16020 bytes
SHA-256: 9afcbe20d848bc6bba98636329577a689034aa8eab8205399104e8173e8da57e
font_02_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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