Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f5b4c69040b2f3…

MALICIOUS

PDF

86.9 KB Created: 2021-09-05 19:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a3d1987f484fc7b63e2011a393dced4 SHA-1: b465e460f4dce9a0307873ae782b11f38ef571ff SHA-256: a5f5b4c69040b2f39f0c7edb31870c958649d9b250bff1883b87fb32aae53bb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs hosted on potentially compromised or disposable domains, which are likely used to redirect users to malicious sites. The presence of multiple unknown URLs suggests an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://steakclubhn.com/campannas/file/2212295511.pdf In PDF document text
    • https://sunarchegypt.com/userfiles/file/76109889332.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/legasazolelabivo.pdfIn PDF document text
    • http://svx.su/ffile/file/80515483278.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/8c472d66e194c3d0fda883448ac39c2d/62271464842.pdfIn PDF document text
    • https://attack.lt/images/files/munesax.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/76042783162.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae175e7949---54534661078.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/nakupaxoxorin.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/96471788283.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/madufatavosirajekasasoxu.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/16746676027.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/59156389448.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd9cd9c10d---89230963989.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/94658741133.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd58872fa8---3651449212.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/16928104165.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d894477acecbbd961985e38028a70995/36032976359.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/wopiniwivexinaji.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/88542954477.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d160611ed1---44379983812.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c76cdd16fd9---28804439544.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/xerotijokanupa.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f258f27f6fb59812d53974330d674167/rojinokeganegoxujasaxud.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/32386837909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=printed+circuit+board+design+books+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_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 17248 bytes
SHA-256: 682c5f65cf60561b9cffdf973a39c6ff26b9dfa1748b38647722ecdbd325840e
font_02_sfnt_off000133ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BA 11080 bytes
SHA-256: 493d8065f1be67847910e745cdb4a743875eb84da1274c121d6b1604bf3e8dd2