Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8591685bf129be…

MALICIOUS

PDF

86.2 KB Created: 2021-07-02 09:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7224fab7cecec9750fda2b7a0cc9345e SHA-1: 85990410fffd9df09d95c0854f16d1a1e40e715c SHA-256: 7e8591685bf129beb6d68b18618805688e4457b22d34d4cbf08d751ab4e1df29
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as lures to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839b28604c6---5207486862.pdf In PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/vozojavuzaxapumu.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d6d875e7f---76711856907.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4d9038f4cbe5ac9a5c47739966a82c92/pufakeru.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3cd2cdf1---19076625158.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/93885881164.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a82ae9182---75590604346.pdfIn PDF document text
    • http://bjjiffy.com/upload/84532190256.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/766f27588bfe0bddc9c0269c4fa432b5/gomavezexodup.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/11bqdda7tabhcut26243gkfoud/68316338037.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/55933069436.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/72662672640.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/bisnv9b55t1vt6jvsqug3336n1/robubotefiz.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/zolumus.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/vv4kqeb3is0rfcb5tg49m7b07e/nidazoruwufi.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ba8092479---21470790448.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/geditanutezexewabubutatap.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/38913684628.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdcad9eec2---zuwesufobezaz.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/12222483728.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dgqhga1icb5rvb44re8bifsi05/17461389163.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f16d145d5---bometugigubo.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/kepux.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/10345666358.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f036ab5c6b932c1748bdc13dc1209b28/8850852921.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/97233169014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=people+going+blindPDF 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_off0000edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 10180 bytes
SHA-256: 57a9d9a9a27871985e0cc8960e4577d9365fef0e0583c48567a3c28dee484c3e
font_01_sfnt_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3B 18264 bytes
SHA-256: 7a6291ad3dc0686e6721645297ceb523681133eb0b59b73f50288efe6a412c6f