Malicious PDF — malware analysis report

Static analysis result for SHA-256 31df834f713745c2…

MALICIOUS

PDF

63.4 KB Created: 2021-08-29 00:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d169164358de0ae80b40c5e2a846ce5d SHA-1: 185879be43d6787de046e30b13b97d6e5f0838b1 SHA-256: 31df834f713745c21f581fb6ffc358f0f8e1031386e9cc2f1c86d642e42be265
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress instances, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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://krisoc.ru/uplcv?utm_term=take+eagerly+crossword+clue PDF link annotation
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097e4078713d---lidukavogegududiruxexepo.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/o8rm78t1ev5nt0t6s0pvlsq3q9/kajuvimijoparu.pdfIn PDF document text
    • https://tepihtrava.rs//files/21301029009.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdb94414ce---vekuvonog.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/kazinirixuxigiriguvap.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160915a6d5ee9b---74706768450.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/569r6qtib8g88r7m22cb16t3nn/78087199516.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/62343740847.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/4953f19c7adfbb48bc6bb432dc63e88f/71246969817.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/79055995761.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/le4vsmvk43s21gvn48uru950d6/xupinimoturofazigewamov.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/69102327600.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/perekiganofuvikebo.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/limadiranusogezeragejibiv.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/77b678df494cf7d9be7249c8f4eecafe/wusujaxunixovedera.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/55d766df0ba1a49eecd63ce3cff80138/vevagire.pdfIn PDF document text
    • https://nomortiga.com/contents//files/jevilajotolariwikimid.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca63ec146---76243457027.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f58c186727d0d0e7ab3c357c5c4006f0/jegurejuluzigonuzali.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/66c3c3eedc66632e02cf8b38b72398e2/rivutekeve.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/bubijixibewuwawerafizef.pdfIn PDF document text
    • 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_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 17400 bytes
SHA-256: 3aa5dbaca39d63f13ddeef009ea2eac31639c0dbb4fc4a88870970b1d229786e

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