Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4c652fc8130f99…

MALICIOUS

PDF

93.6 KB Created: 2021-07-04 08:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3344d1d181ca9260c12f2cc263f7d665 SHA-1: 45d8ae27cc20b70808160f63b6cae11e424cd287 SHA-256: 8e4c652fc8130f9927ebcf00698e5f0fee495b4f832505faacd252cc15c0fe5f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://sskj.pl/userfiles/file/xonerosojokunazozigon.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c41911bbdceaa236c7ef6e43b243d77a/danomudafol.pdf
    • https://magerp.org/upload/files/zalav.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7d4e8747b---47920595250.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27423bdd77---xofokewawerojoxiwewi.pdf
    • http://andlupa.com/userfiles/file/5855500352.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00b19bf25---2421559395.pdf
    • http://aweibel.com/Photo/file/mifikowanoparomeluwel.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/23256834931.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ajaeaqoitvui87lj0psauea3e2/35839338931.pdf
    • https://pasarantogel2.com/contents//files/paweponelixax.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/juwononokamaboxugoz.pdf
    • http://suamayin.biz/userfiles/file/xigeratojuzive.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160766dd997367---634569299.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160805da64d028---70465014547.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/780770110c2f5b1a90f44bb080eb10ed/2947042683.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2182cd1ff9---6135212285.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3a1580fc2c3ce76c5a10bd2f0da9be30/jimegekapopex.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16087ceb5b75fa---kifewepufoposonimu.pdf
    • https://morganmethod.com/ci/userfiles/files/xaxekupuzifufesuvezunema.pdf
    • http://neonatal-surgery.ru/userfiles/files/vejobufafugo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=all+about+equilateral+triangle
    • 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_off000107c0.bin
1accd58811400f63eb286a6a54d4d79a7ca8b1fe74dda3f8ccbd55c72a0c463a
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 19288 bytes
font_01_sfnt_off00013a73.bin
c448e741abba56de25c382a6f5708b3c4343db6de6c406318731455c576266d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A73 10480 bytes
font_02_sfnt_off00015210.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15210 16792 bytes