Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d79c384370871a…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 04:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a39e75fe99a7949b85b4a6065eaa0fb4 SHA-1: 6bc710ce736683bf5d3c0cac685bfac69e8f7b3a SHA-256: b2d79c384370871a778d6823edbd16fa10dd0d3b3540a990839f2e5fa585c15a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV/ML detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/m5oqsfrai8vs2gpmrp4686n090/72470968380.pdf In PDF document text
    • https://amrapalispot.com/userfiles/file/mudepuxinagujikiso.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/ribefisuwew.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/leq42rhbp6eb9h207fan2oajc2/jewolologefevomubojila.pdfIn PDF document text
    • http://pk.mo/userfiles/file/rikubositopolevesezewesog.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5c5accf03---59513245563.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/parosatavodoweboromakero.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802adc9c1e0---8105152930.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ve1cj1c9tr32rt4c69a74e00a4/41400400414.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/74657603220.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/75741854368.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/68755762921.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/fhv1slr34a6o6ob4cev5mfg4ob/xutenugegibizi.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/tadofera.pdfIn PDF document text
    • http://clerus.hu/files/file/2993833717.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/36849926991.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/26858418873.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d282336fad1---7129240590.pdfIn PDF document text
    • https://vestol.bg/files/file/dejadaralikibupotasove.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/4041482026.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16121035fa0ed6---gafudimijar.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/1dkkmqmrpude4j29f6a8ecttd3/77108010707.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/91860318468.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/87582951629.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/33690039892.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/powavafowarifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=receitas+saud%C3%A1veis+jamie+oliver+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_off0000c145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC145 17720 bytes
SHA-256: 97119ba9450114c66ef9874745444f75bb608cd578865072dee165ba758b414a
font_01_sfnt_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 11200 bytes
SHA-256: c956fb99e7348f3fd4e802905972be03d4b25dd38841f5e1171930db8a245b10
font_02_sfnt_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1