Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca219112d06b0aa…

MALICIOUS

PDF

72.3 KB Created: 2021-09-18 17:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cbf1854170c83ef7c47c0b65de518831 SHA-1: a2c0a308c1f3d2e648d04ad91ef4847022a68224 SHA-256: cca219112d06b0aa613a4d8f96937f9194f746e2a89485fe45afba60260a5981
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term_redirector=True' further supports the interpretation of these links as part of a redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://keluargamimpi2.com/contents/files/gifefolozarilu.pdf In PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/weduwevo.pdfIn PDF document text
    • https://slotpt2.com/contents/files/94209205404.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/tabasatunot.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/nejugelabubed.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210902091246.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/medenusizotakafopanezoz.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/90745851283.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/40919291590.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0b978354---serebawezugufumu.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/pitajom.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/66683553093.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210911_89C4BC287843BEEB.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/16950379951.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/749a9c042d16a57e6f08fe38d8c1b610/42895040105.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6a52e8d447410da1227452284d811f91/ripamupelu.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/35182804594.pdfIn PDF document text
    • http://bulmarconsult.com/files/welivaxukajaxek.pdfIn PDF document text
    • https://dm288.com/slicice/file/genaruzeletabitajulitipud.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/37185197162.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/43695471734.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/jejerusobo.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/kilelorolu.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/tekibi.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/8q49tjlhct3upn6fo1p11fdtc7/zidudunobenoz.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/2865888883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fortnite+on+phonesPDF 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_off0000baab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAB 16624 bytes
SHA-256: 87b207fcdd93a0d374a4c3a39dd75baffda1bdf885ef0358818fd0b703cae3c8
font_01_sfnt_off0000e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 10120 bytes
SHA-256: 099d20e95503c31de10757b9cee462cb551739775c8a8ddc401f4b971abff249
font_02_sfnt_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1