Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c981dda6e0731e7…

MALICIOUS

PDF

68.6 KB Created: 2021-07-10 04:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c2134bc90842d551c407e8f9bdda222 SHA-1: e80d07042af726e488c2e74f7620771173fefb87 SHA-256: 5c981dda6e0731e740e5c77359f1d6ca5e02ee1241c569b3d1dee7e0f592c28b
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The document's structure suggests it's designed to lure users into clicking these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5262

Heuristics 5

  • 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
  • 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://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de89a5eb020---sarugal.pdf In PDF document text
    • http://verkaufs-akademie.com/userfiles/file/poketokigezokiwamedigevu.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/32845554768.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813ab1389d4---13157644510.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/padl3jn0khrsrnro06uclmohc0/26602034381.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/u6jsum9ppmdd53csgqajd2u1dd/texagobemomixalaviv.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/um735tm7lq87vmtsdbgsurq98i/nuvibigemeribozu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/cdc674824952f7fb0c7aad8c729ef583/pavipufozivagem.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/4f46ed645fc66735ff15512a12ac8ceb/labipunurirede.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/6e80f87e7fa37f43a138b8c3e460ef77/19488765145.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608196fa1017c---43328101962.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/82283484962.pdfIn PDF document text
    • http://accronline.com/userfiles/file/figijonezezagugonozekeruw.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/dibag.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/bcf84cb7558006194a5f344416210462/gedepijirujijow.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/mv5iif0ev42hcse01pg9koscuc/90643281848.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebe97837a3---roputevunijamejamegeboju.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/3224490116.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086dcdf49555---76232047228.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/zuxedufasobaranab.pdfIn PDF document text
    • http://turatabor.hu/media/sipevor.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/banuzixobitefevamexiwuwaw.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/wumoj.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/91386851108.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/jamuledere.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/81046827761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hypercalcemia+paraneoplastic+syndromePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1