Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a6a834cbf1fe6b…

MALICIOUS

PDF

86.1 KB Created: 2021-08-24 14:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82a22e30c6f2774867c68cbcd048fdfb SHA-1: 1c37f9b1e5ad1471e8564783eebef0db4c3429f8 SHA-256: b0a6a834cbf1fe6b8915c86accf1deaec0e1228b1695d229d278402dd1dfc9df
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://irlanc.ru/uplcv?utm_term=price+of+desexing+female+dog
    • http://tznjl.com/userfiles/files/vokokibiwadepusebosajalip.pdf
    • http://skrutit-probeg.ru/upload_picture/file/9160021935.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff311e9e88---29560687235.pdf
    • http://shuswapladystriders.ca/userfiles/file/89724488230.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/88a8da39230d2818c7cefc81a0f8f850/tonorev.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/asgg9vd7rasqnaer9fqg5prhh1/36420221587.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/pevigajuzeleg.pdf
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/guxes.pdf
    • https://ibexquimica.com.br/ckfinder/userfiles/files/vatofikisuluj.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084c48dc0e3b---xavev.pdf
    • https://himalayanthailand.com/image/upload/File/medumapexiriwe.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ou31pitv57hfp2u54rm4pi5472/zagapironuvo.pdf
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/xokemoronapapazi.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5d6e1705b---sudonuledumu.pdf
    • http://kiajihlava.cz/UserFiles/File/63627081446.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/6c6ab15036f5b881dd0403c92c36caaa/3677907640.pdf
    • http://hncastlecable.com/d/files/10498283928.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/fn98js5tergug1n6gpcplcgijm/ninebamesexixelabijowuke.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4cd0d039---donasabosif.pdf
    • http://landonintergroup.com/ckfinder/userfiles/files/sozavizagizafe.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e92c8158a46---taketema.pdf
    • https://vicotelecom.vn/static/source/images/file/rasuviwekuvadojonaxedu.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_off0000eed0.bin
37f3d5fbaf04163de93a10b4bc39d70f9b1d8a36072b86aaf31658081dad128d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 16380 bytes
font_01_sfnt_off00011933.bin
cfbc4f20c41acaace4efa84e15253f14ef9d820fba29af108a3c320070f06dee
pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 10824 bytes
font_02_sfnt_off000131ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131EE 16792 bytes