Malicious PDF — malware analysis report

Static analysis result for SHA-256 f602f1e1cfccec4e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 22:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7132624e5aad23e16bd8961072b09bd SHA-1: f9bf3159a1d985a4073794ba797392cdfed0f598 SHA-256: f602f1e1cfccec4eaa89b28c8798123c41daa913017634e0541003d712cf5799
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload storage, likely intended to redirect users to phishing sites. The document body is unreadable, but the heuristics strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://miydz.com/mingyi/images/userfiles/file/bukaloripisov.pdf In PDF document text
    • http://zaiger.ru/img/file/rukewigituzebigebapi.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134602c259d9---24782933431.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1t1rvas79sd8l8rrkn6ova4a63/ninisix.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/fesanuduwolejawedufe.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/86677876983.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4b0aaf3e1---kulugif.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/dodovasajinenizav.pdfIn PDF document text
    • http://belloverde.net/emailer/file/3738107083.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/72167814609.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/retojobemitakewuzuzavijoz.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/35460444000.pdfIn PDF document text
    • http://infunplastic.com/d/files/11357379626.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/kitikudodigopoxi.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/87812109749.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/xoveferizasewupote.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/4697987359.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/77990845833.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/5156888097.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/vimufonidisabopujolar.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/59879776394.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210907124833.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/98425890772.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4cb0574f7adfac357da4ebf2b6e08645/24072611409.pdfIn PDF document text
    • https://ikima.fr/uploads/file/fififovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=redmi+note+9s+resetPDF 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_off0000d71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 10412 bytes
SHA-256: 1b05f44681f00579a36b374bd68c70bc5c8778f21b8bb99bc709eec2b6333853
font_02_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 18892 bytes
SHA-256: f82cab0a1dcf073790d01ee3baac2cc11fe01f394095033921e6959e7ce8ec12