Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0212b2e3b0a82f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 08:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39e933ce1e02961df2fba9b1f78e4d66 SHA-1: e159bd92446b193b50540a3ce97b4a03bb525a0a SHA-256: 2c0212b2e3b0a82f284a6e60d72ef8d8dfa71bdbb9429ba753f3801804622ac5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL analysis point towards a phishing or malware delivery mechanism.

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://mistral-paints.cz/userfiles/files/64444394834.pdf In PDF document text
    • http://radtel-sport.pl/userfiles/file/59625643158.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/7272125580.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/17443487708.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/85035002881.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/52b6022285e1c149a1acb5132b394e01/puxuzutovibutaxo.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/juselodurom.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/visojukomukizutizulo.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/91581986718.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/fosasaxuzalanokowek.pdfIn PDF document text
    • http://moretonassets.net/userfiles/42300932773.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/visasivumez.pdfIn PDF document text
    • https://posh.hr/files/39550830603.pdfIn PDF document text
    • http://fitviewer.com/files/file/42904484101.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/nogudekenifufosewar.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/60838084414.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/botenifaxir.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/56961039586.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202108311814089554.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/bemusesopalob.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/7g3pdnj4mht4v7ake49t8oumn2/63923529321.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zuvipozinurun.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/fudobepamipajep.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/42743549242.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374ce7b71e7---zimuwusesukuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sultan+2016+movie+onlinePDF 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_off0000d47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47E 18020 bytes
SHA-256: 3e401632156a66a9f5e0132de06ec6e9a4939a59500b1eb771e9892463f2601a
font_01_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 10704 bytes
SHA-256: 91907ab8daf9c44b8bd621b4087664efeeeea2a51ce747252c0530f41e93c3bc
font_02_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1