Malicious PDF — malware analysis report

Static analysis result for SHA-256 8904e88eaab45166…

MALICIOUS

PDF

55.3 KB Created: 2021-09-03 04:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 655ff68a2442af3be46426ac350fac1b SHA-1: e27ac98ef4c207d8b815c0efe0002f37564855d0 SHA-256: 8904e88eaab4516608ccf0831d9ab602c7203a0f86fb2a396fe479be528d8899
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5046

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=fluke+381+clamp+meter+manual PDF link annotation
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/54d26298169c61e0cb59476bc0adac15/69656457297.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/76042766449.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/asjcrumr01b9inc0bke53oaqf0/39601697041.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210713161730.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5287bbd58---fudabilitusok.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/i7nlmii67bqpsts534o8as4bb5/juzikudidipo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da46935a330---39204878334.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/dupawumewimixiwifomonigo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7235fdb7e9f11c62410357c90f1a7187/fotomefenadiw.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2c3011174891e6d0b16af259a565ec49/99673254555.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/90320030524.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/64547836801.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621298007.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/fagezefafivuxapimin.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89e9eeaa1b---gagibumexote.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/godatiwokanusuzodud.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/govadafumuxopazapabadodej.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/63054351822.pdfIn PDF document text
    • http://mlead.net/images/e/file/vutajowisafegujuxab.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/xugowosemo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705028c9f80---rekadetaxunali.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/lijafativ.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a09f6e93884---virikaxop.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/pijafejusixabinokebuk.pdfIn PDF document text

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