Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65b4ac337400ba3…

MALICIOUS

PDF

65.1 KB Created: 2021-07-09 10:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6a4b0fcb1e52bfba66093fc6343a36da SHA-1: 7c0e160cdfd22afc3ec50aaa688db33d09c229a4 SHA-256: b65b4ac337400ba36d0095f49e812dd729788465db0eddc8bdb4921b68cdad32
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs pointing to compromised WordPress sites and potentially disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6468

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=bsc+calculus+notes+chapter+1 PDF link annotation
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/e383e6c0f8cf3ca8a667a223e428ff85/8478523497.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/92010213368.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/7291298465.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0b372afda6f37bd4236c5ca57143eeab/tadukomuduzase.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8c2d1855f---64990867339.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607882dc733fe---81043659915.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/cb21c8ada8ba5c32bae9eb24a4af3503/27590283312.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d4cf510f58be62b7f3911175157020f9/wokemurasuzivimopipelome.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e18807dd940---fesojofitulofanapumipa.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba92cd18660---11550478234.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/185b7f058690ccba361e648fb17fce1c/bululikesuxesizinid.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf4e9b29d0---15741115129.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea69516568---kiseguvewavurekam.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/1msluc1v73l0o13gqs3gc8caj2/45338222577.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/jtpk2p9ug9ic5lujjtbcl1lvt8/24207140334.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c4eedead8ecca87793708be78a432069/wunik.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/49997455850.pdfIn PDF document text
    • http://berbun.com/user_img/file/wetox.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a7d1aac83---31914027738.pdfIn PDF document text
    • https://drlanda.hu/user/file/mifidujuxipisafirazibut.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848562a2b9b---15667090756.pdfPDF link annotation
    • http://nlureunion.com/clients/33063/File/1492990955.pdfIn PDF document text

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