Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a067fc9c8e460a2…

MALICIOUS

PDF

85.9 KB Created: 2021-09-17 08:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f0b3f71e19b51e84d04b3bfd26cab5e SHA-1: fa0de1cbbc47c749a79b426f8fb8079bf98ad732 SHA-256: 1a067fc9c8e460a20ebff076e5e66e8615f4707d5396a183b8113b5c9bf871fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure, indicating a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. No scripts were extracted, but the PDF structure itself is indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://uclerbaklava.com/resources/file/ferorureloziferipuvege.pdf
    • http://inciboya.com/resimler/site/files/90196752575.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/3818292762.pdf
    • http://thepokeluau.com/uploads/files/xofogukedebapulalikafok.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133646819549---26573187425.pdf
    • https://dortmundpools.com/contents/files/wotikixonibeta.pdf
    • http://adamlegal.com/userfiles/file/12248876099.pdf
    • http://shangrilayunnan.com/ckfinder/userfiles/files/96311701228.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613700bb5cbce---temugenosefap.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130662e3ba48---jumokologuwilobasosa.pdf
    • http://espwireless.net/uploads/file/wewepunoram.pdf
    • http://namadagaskare.ru/ckfinder/userfiles/files/kunibesamigop.pdf
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/49990032192.pdf
    • http://rts-3.ru/upload/files/6684554934.pdf
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/dijirojuzanul.pdf
    • https://12shio4.com/contents/files/1645387651.pdf
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/tewesejilixagi.pdf
    • https://aymexco.ro/ckfinder/userfiles/files/morawi.pdf
    • https://smilaxlabs.com/userfiles/files/42884459657.pdf
    • http://qianxish.com/ckfind_image/files/65303966445.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/58121493305.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/t4gdti0aq0id7flbodo80rfcnf/14819268948.pdf
    • https://benqmusicworkshop.com/fupload/file/dozakifoxuzo.pdf
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bimofowozepe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cooking+madness+android+1
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9b4.bin
341f82f042665a514630c28b46e944e045488b67339a12fbf77a5458334a2a3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 22220 bytes
font_01_sfnt_off000102bb.bin
224d2e0cffe27c6a05454a5fd49781f82b973e577f5c8f6a35fd3e1017b6fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 10620 bytes
font_02_sfnt_off00011ad8.bin
52dd5067e004a5093f19d447f9e7e67fb382ccd5a9785c067e4d8a9ce714e481
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD8 16340 bytes
font_03_sfnt_off00013131.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13131 16792 bytes