Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b6f103b770c03f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 20:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77ff8a1c32aad2930a08c0c4cb70f8a9 SHA-1: 6f6f757508756247973e040cf4e20712aa048b89 SHA-256: 07b6f103b770c03f16451121b789c03493e985c174d12ba85fb4b64581e47f9d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of numerous external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=jogos+do+super+nes+para+android
    • http://irodaszer.lukinserv.hu/file/94305925036.pdf
    • http://co-wemart.com/careeruserfiles/file/9548399382.pdf
    • http://ongxoanhdpe.vn/upload/files/13202137992.pdf
    • https://marathonroller.com/userfiles/files/komalagonekemi.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613508616f86b---41623945666.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8f4c7d27c3ge84jbv8p71suanc/39246676201.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139793cb8b07---kuxiw.pdf
    • https://www.naabelectric.com/userfiles/files/72862391908.pdf
    • http://dfanchem.com/upload/files/totivureloreraditununi.pdf
    • http://bilafafafa.com/shopadmin/upload/files/78490562703.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ridozigepibojodomowebovok.pdf
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/80832038169.pdf
    • https://terracetemayonetim.com/upload/ckfinder/files/95772547981.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/soxobiten.pdf
    • http://vidol.eu/userfiles/file/xapogagefus.pdf
    • http://harchovyk.com/userfiles/file/75751762713.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161339de9449ef---63082105233.pdf
    • https://drjou-vc.com/upload/files/vojezowamivupol.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/c157c0450d4579184c9f8b55b77f5899/95346770726.pdf
    • https://vicareyou.com/userfiles/file/mebuluxafe.pdf
    • http://baheth24aqari.com/ckfinder/userfiles/files/35407995537.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B7 16792 bytes
font_01_sfnt_off0000e8c9.bin
cc29a9cd00e051be4976e14679d6ca319e3864ee00047f97b4b1aa7db1fbf76e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 19080 bytes
font_02_sfnt_off00011849.bin
731f741100c7a0a222e16a67eea1dfa979d1bcd8f83cc7d5345598a89112d153
pdf-font-stream PDF embedded font (sfnt) at offset 0x11849 10516 bytes