Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4496a2a221a2ae…

MALICIOUS

PDF

90.1 KB Created: 2021-06-25 23:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4fc2b09fd18051e07c1ce5ae68a3287 SHA-1: 3a18255a52253cbd07d098ab019b90caa320e329 SHA-256: 4b4496a2a221a2aecd6fe577ba058325b6525b8f8f053495e7ceeb33a5fb4c31
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely serve to redirect users to phishing pages or download further malicious payloads, aligning with common tactics for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e032b4890e---48611056259.pdf
    • http://alarcon-v.com/editor_upload_image/file/83466790303.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e66f2f797---18319428056.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1369c2aeb7---menovonodupofovakenage.pdf
    • http://homelife-superstars.com/image/files/36790037876.pdf
    • https://aronabritcan.com/userfiles/file/mekowedaf.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c2176c4cd4f---78017125408.pdf
    • http://globeksa.com/ckfinder/userfiles/files/6867490335.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/135f3e7b5cefd8c2d3b0de4d0f85cd46/54968116903.pdf
    • http://cuatro-pr.org/sites/default/files/file/bover.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/86c9evqb7dpipthokb2uuhnm72/94252955019.pdf
    • http://asianmosaicnyc.com/userfiles/file/ganujunopetixovum.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/17e6d5561199757a9d210c49ce81e737/78944742106.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/565481b023dcd2308fd9c3763b9f3ce8/77571012164.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a59513db39d---lapuluvopevegagisalu.pdf
    • http://geteffective.biz/uploadfiles/file/galamofafododemo.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608823c8e4c86---91364093653.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/c0997e9052a939ff43bb0c47b17c8d6e/kekojakerutupanolixa.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e8175e440---15648778113.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/90b61c53555f8dda06c79911004b2b19/15675883796.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e6fbcb194---jarudikegeje.pdf
    • http://meble-tk.pl/userfiles/file/xaxufizakajupilodazon.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/cfm8gc5ljjh9lqjptnnokbh3lr/fapixusejegojever.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=halligan+mystery+of+the+druids
    • 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_off0000fca3.bin
05e67aef503eea7acdb66bfc8812a5d78d44824c9f9b14374258296c1c35648f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 17532 bytes
font_01_sfnt_off000129ad.bin
edf4c6c9ebb8bea0f1d5cb3764ed12a0e0473c0c06d3b19ee16dc923c4d16596		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129AD 11004 bytes
font_02_sfnt_off000142d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142D1 16792 bytes

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