Malicious PDF — malware analysis report

Static analysis result for SHA-256 e009371ff30203f7…

MALICIOUS

PDF

94.0 KB Created: 2021-08-18 02:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 639033a3e0af480b5c24a0f2f51abcbc SHA-1: 2688a1dfa9e55ad30bb0e6adae302ed80d0056b7 SHA-256: e009371ff30203f77d7ee179e08a3d05d73c85b134367626b077bdc3fb8c6833
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://queure.ru/uplcv?utm_term=yale+brown+obsessive+compulsive+scale+scoring PDF link annotation
    • http://xaydungphongphu.com/uploads/files/ponanuzegirobalodapiju.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/54921242172.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/susumuruzopi.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabf1542eb6---bijogig.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3125c0c1aa---50004756383.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/7154c240aeeda3a5fffd30dd817022f5/buxala.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/lrsr2t6tkkds26gnfmpnomar2m/xazunubexikobu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/145dc1a9383d634c4d542cebd67e0754/97411325389.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/xeterape.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a00ff27518d---26020788137.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/1507599824.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/41533162508.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/78800835831.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/oku9a40op3oco7r3tugheprd45/sodepiwuranagu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f02119898---5081386831.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/79953215905.pdfIn PDF document text
    • http://letdentalab.com/img/files/88838274310.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fnsoupqptt833ak7p34vbijr06/zaxozat.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef6602d502---88637629232.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/24872740594.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/xadogojudapizudejusilur.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de8f1464360---75236344112.pdfIn PDF document text
    • 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_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 17644 bytes
SHA-256: ad4b562142e56083730b62898475f228e79b2fcbea117618a1697548fd6018e4
font_01_sfnt_off00013600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E17 10992 bytes
SHA-256: c2d8b7bea5dafb5cf3b41af725e3f4f9c36814f72559ed3addc5ced95bc25e1c