Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a26c2fb8082f55…

MALICIOUS

PDF

90.3 KB Created: 2021-06-30 20:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50635ddefc9c125edbbd6447da98b41b SHA-1: a2344d24e42a15389283cc63aeb63e989e4bb6f7 SHA-256: 89a26c2fb8082f55864f604450f8f9c7daaa94400644ea7fe019f9ca830a9b88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious content, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/e0b17osul8v4s2r4u91439sbae/45264820355.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090f320ac489---47696429854.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a022bf7f236---mujopumekepu.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2fd3988d1b79dbed4f699a6ad8890f81/tevufavofi.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8d3a4177b6d30c306e1303990f1f226c/90334077326.pdf
    • http://bkbflooringusa.com/userfile/abbey/file/87225521564.pdf
    • http://ozhelalikram.de/resimler/files/37165334477.pdf
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/navawitujasixawesutexado.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3a5f79a6e---92671264908.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/fba14e02ce52c41d58abd74c2068c294/sevedeposinunawazajewisek.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ca9ec07d---53885981187.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a322e492738---39901883878.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/99a956d6879ce5b8a1f319ec33a320c3/95130562493.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/8f8c08db3308989b3ffcf03a6e2551f2/gobokakexanofawogeruj.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/82s0qmd0c9ar0vg4tausjqjq9o/tipikomibifimivijupopor.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/53aa0771594db09452e9d70de3302c06/wumegenonasuvisot.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/cfc57ce788722a9baa3667e1c62ba79f/tutajogivategajiluxakoku.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/ae76c6fe222bae2cb7f3eaa5faa5face/3998529571.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073749baf253---36562070174.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085d354eb726---bimemevukizadabobovasaku.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7el3p8j9n55cuj7pjnduqbh4e5/96876984852.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/37de2c9f104d6f44d3cb52343d633089/vibiwubovawodefapo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=partition+expert+free+download
    • 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_off0000ecbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 16792 bytes
font_01_sfnt_off000104d4.bin
90f8f9e015ae534dc967ef39abcdc10394aa218c538cd688b076f8279b545a72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 10512 bytes
font_02_sfnt_off00011ce3.bin
2719cb4c228041f8290b8244fa973601451319489d38712765ea108480aec443		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 32076 bytes

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