Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b83a41be2f2ea3…

MALICIOUS

PDF

73.4 KB Created: 2021-05-30 11:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8dd077f1389eac864e1ca8fa0876d70d SHA-1: 393b026815f9c15535672d9049f9314ec030a6b2 SHA-256: 96b83a41be2f2ea3d4972e35ce550686f51717af35008930821e755ce2a87120
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis point to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/fa78abf650ef058fb3915152d9af788c/23312495612.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa67a0e2d---47894231939.pdf
    • http://hayatteknoloji.com/webimage/file/jajodekepuwisabunerajo.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f7d1dbd12f98147e33bfb06490a47710/safebidemonazedag.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092c440db395---36619518848.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/mejapudatenasuzoge.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c35bf1c3093fbed258018b6271619a4a/86277141747.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/9vbk7ef415gab6691d1pvrni1q/towafisu.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/4c17501eddaf258c1665529c36d18ed5/45473904919.pdf
    • https://anukulagrotech.com/userfiles/file/96614004537.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2bf1f28e6cebf9ff7a739f8b071120dc/75261743598.pdf
    • http://aggengr.com/uploads/CMS/file/61224316750.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e9c16af17---83721131601.pdf
    • http://accessprecision.com/userfiles/file/dukobuletizupulezew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+blazed+glazed+zip
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e024.bin
61e89848594040f143f8fcdbdb060e639a763c115ef317dfdc2f92b8b954556b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 5260 bytes
font_01_sfnt_off0000f204.bin
701b0f2beeae77a7127907de2b65194d685e55141aa82b68d2ec2d7ca38809c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 11808 bytes

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