Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbb585608acdab3…

MALICIOUS

PDF

77.6 KB Created: 2021-08-15 21:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 569b111cb6dcd97f654649264587ed7e SHA-1: a7e972922edb3e3f4f967d0ff2c961af9f56224f SHA-256: 0bbb585608acdab317c32aec939f6802e56b3ef2777b14c5db8a35545e45bc43
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The file's structure and embedded links indicate it is likely part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://garglob.ru/uplcv?utm_term=pearson+myworld+history+textbook
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ib9599tckokl6dqg6q40u2u2p0/fejosirim.pdf
    • https://pepinieramontana.ro/ckfinder/userfiles/files/46443252628.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16084e9cb3117a---49915340867.pdf
    • http://indel.sk/userfiles/file/56706107815.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/wepumalikaxivisenoxine.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/1b0bd481db1a7520533512df72738f34/58295571505.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/61d0352f4f0f3b84a11949a6750c8593/52894179158.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114aa4dbc2f4---tikujumutolim.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3f5eb9df---48776731839.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608544e8143be---babavoka.pdf
    • http://aqbnb.com/uploadfile/file/tisowazaselipenovefewino.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160877d5cdd482---96566181137.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078bb35e590c---komineb.pdf
    • http://owv-sad.de/userfiles/files/31399396753.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5fe053400428137cfeb1695e3106ef14/dapaxijogowej.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e4c6a3c8ecfb074aee6dedda7fc8e841/77669088494.pdf
    • http://m2m2design.com/userfiles/ganifizobutir.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/48380681047.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/kh7n46f92quprrsap848lpme52/32882079465.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c26e29f0c27e4b72c7e0754e296dd7c5/manifez.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb106d7506---renidafuperegadudogusivi.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160be98b3935dc---50818525617.pdf
    • https://ketdoanbus.com/webroot/img/files/tagenusupurama.pdf
    • 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_off0000c67a.bin
a5aacac158db6cce5cae398c48e103ca9d719866190b18f8d790b9bdbe5bbaeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC67A 18872 bytes
font_01_sfnt_off0000f676.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 16792 bytes
font_02_sfnt_off00010e8d.bin
8d53ab4b8a7ab32cdb7d7764b6dc0c585c5a3b58bfa2d6808014a08f2ecb5879		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8D 11048 bytes

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