Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a7c3418aa7aa78…

MALICIOUS

PDF

90.9 KB Created: 2021-07-02 14:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 101940beab237ed245ced56cffcd229b SHA-1: f1fbf034f01f42f7bc363bb98b449cc8d9d22b06 SHA-256: 33a7c3418aa7aa78731d79dae21ce2a9cd7aa0eac8a7291b6a70185e456472d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=home+of+happy+wheels+unblocked
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607682299d8a4---zonuji.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c5a023e0732773aa16d9699c0e0261d5/36555595501.pdf
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/19785910478.pdf
    • https://pergamine.com/ckfinder/userfiles/files/83056667125.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/f6r2mrdm9hcbaip8pgdh1k2lho/93942642397.pdf
    • https://motacademy.it/file/mawitifiv.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf214a83450---xususisef.pdf
    • https://royal-art.pl/uploads/userfiles/files/66437541257.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/eoeu06npncpifh9toc146f9cnv/2750044059.pdf
    • http://studiosiciliani.eu/userfiles/files/biwomeginafigilikazalune.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/47b98261edce007fbb726bdc9c9485d5/kututawakumevireseje.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/27699455630.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075c4a66bed7---51119479258.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ca28e6dc97aaf8b01da9367ef2e8032c/dadiduzon.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/07c5f359fffd085aa25477662be9f567/23939147957.pdf
    • http://lideparts.com/userfiles/file/1622129224.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acb91f3ffa7---juxibixukutare.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7261043a1---janavepepalogevidinu.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/nilejepobepobife.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a577b912e21bda432223ac2cf998a184/tegexokajurizixirimozi.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/18829067168.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8c068836249dbfde2b605865e410f490/visepinorepajogimidudoma.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160823a0797308---45840134545.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/42e74ade1fcdaefd213976e96fbb3296/ziweno.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094bec173ed5---12754397219.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_off00010054.bin
430b0f39cfc3b89484581730976216cfcd580da347349c67b0a06fc47dcc4597
pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 16944 bytes
font_01_sfnt_off00012c90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C90 16792 bytes
font_02_sfnt_off000144a7.bin
ee345a4ac5f5d868e8fcce4677f3f2b881ecd448f2d4fd7595209395e2a14637
pdf-font-stream PDF embedded font (sfnt) at offset 0x144A7 11120 bytes