Malicious PDF — malware analysis report

Static analysis result for SHA-256 655acf0e786d1deb…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 02:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 122d61751415d5407b6923962b77e74c SHA-1: c83094f3eb3665a38d55d5ea1112929aae360d8b SHA-256: 655acf0e786d1debc7bedb2b2501238df8e18599f8b1fa9c568e27c404ae63b7
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, specifically as 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to distribute further malicious content or phish for credentials. The PDF structure itself is heavily obfuscated, and no scripts were extracted, suggesting the maliciousness relies on the embedded links and potentially exploits within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://kinel-hunter.ru/upfiles/file/66172972588.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/8399jlm6h4uj17lq5t6f0gdg64/fabegopusulogafenoxikux.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbe976cddd---vadizex.pdf
    • http://hzbmsj.net/images/upload/File/botitakekuzuter.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c99cb4296---lokik.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/8585ce759d31cecea54c78dbbd4e5048/26988470917.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a314d65d48e---92013707450.pdf
    • http://eperon-kochersberg.com/img_db/papalezejus.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/57ba28f9a0ebbccba6fed8194bfe95d2/fapufuji.pdf
    • https://bkht.vn/userfiles/file/33179616554.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160beff0b89382---sejoreleferuxofuwewuwak.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/64799733284.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4f37b32fc4344442f061b6b2894b91de/mejegofubonubitoxamituxe.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072780349e5e---89801519343.pdf
    • https://hoalavender.net/upload/files/33430102515.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb722b030---fowogapivasuvado.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/pp9ormlh7pj5rrmoanhlh6t1iq/jagowolaxosifawipepe.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ef2bc3b6f30e18f145ebbf054e6faa0d/82946403715.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c29fdcb261c---4934693594.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5bede58d0---livarur.pdf
    • http://poongdung.com/FileData/ckfinder/files/20210616_38D4BB4306CBE368.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/r79pgabepbju37ctp8k2cm3dsf/tozebaten.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/uq36oa276torckarn1ovgrf7j1/30686797819.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/tnegq17555ugti9cje0fdgkpt3/67984305977.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+draw+simple+duck
    • 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_off0000edd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 16792 bytes
font_01_sfnt_off000105ea.bin
5c14e94988cc4cc1a803d3298cf929574d91b9ab4fab2ec0164b42a18ebbcf91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 17400 bytes
font_02_sfnt_off00013351.bin
a26ec19635690ed9d1fd3255817c8be4090cd8508c0d58761e41ef7f3248c3fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13351 10840 bytes

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