Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c57e4c45fc1ffe…

MALICIOUS

PDF

82.3 KB Created: 2021-08-31 03:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2c59e20f3e214939f44a820449c51da SHA-1: e6cfbcf14822de827c163f30dc09b0d26ec47915 SHA-256: 95c57e4c45fc1ffe0857e05b1b92e10d0f00429ffdf366accd400e79902e54fd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm is designed to lure users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/fc52e3c82f83a4630addfdda30381c61/94104211708.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e688b410a23---77633622805.pdf
    • http://agcslohian.com/userfiles/file/gabukolegu.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/37747123606.pdf
    • http://eltonltd.ru/sites/default/files/uploads/tinajuj.pdf
    • https://begili.com/uploads/image/files/59885288387.pdf
    • http://trekkingsapatours.com/upload/files/rupexiwak.pdf
    • http://teplorium.su/userfiles/file/51262836108.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a1cdd6575---xigizus.pdf
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/kelowolo.pdf
    • http://asokmontridental.com/userfiles/file/xogurasujibufewanij.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16128df3cd12a3---75124181075.pdf
    • http://primeasset.hu/fileok/file/nanapona.pdf
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/91794853891.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc61d690b---xikudasijugike.pdf
    • http://lycee-elm.org/userfiles/file/76345972827.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/12223645569.pdf
    • http://rigdrilling.org/userfiles/file/85097603966.pdf
    • http://amoy-art.com/Upload/file/nepopokabisurubudikumuzat.pdf
    • http://ifap.it/images/file/80349430993.pdf
    • http://ninda.vn/userfiles/files/tijinizokaboguropu.pdf
    • http://tnshoppingbag.com/upfiles/file/wiwenafifawosulujoz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ancient+greece+architecture
    • 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_off0000df79.bin
e057ea1f7690e99ef3a0bf8edce710c77bfdd7a2a2eb4ebf71de9f06a7a69c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 17236 bytes
font_01_sfnt_off00010c15.bin
af9b897e6fbf97f3d3c74e333105d60f40c3c991257ff31489741323f3daf840		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 10256 bytes
font_02_sfnt_off00012317.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12317 16792 bytes

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