Malicious PDF — malware analysis report

Static analysis result for SHA-256 681af4dff2c8ef65…

MALICIOUS

PDF

42.3 KB Created: 2021-06-09 13:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a9c8ea61f62420fde246ecef08f7d69f SHA-1: 0ba8eceb33515e5440907ab3750d07e5c6cb83f5 SHA-256: 681af4dff2c8ef659baf801972682a510067b9775384f88a5f3aa796db42a930
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document appears to be an image-only lure, typical of phishing campaigns, containing numerous links to compromised WordPress sites and disposable hosting. The presence of a 'utm_term' parameter in one URL suggests a phishing or spam campaign aiming to lure users with a fake download link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 42 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nomylo.ru/uplcv?utm_term=batman+arkham+knight+apk+download PDF link annotation
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11c5192d9b---felajubevovelutok.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b469a9406---ferop.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cbf3763c3---xuwuzunoladeva.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0bb4d56d5499df88d58459a1f8c4327a/27600970431.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802f15a05b7---49206340523.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e019968806---97689842347.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/33311356206.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160928ef983127---lujino.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160948263ec61d---jiguninodarijuzod.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f84acb394---23616948210.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/rutisezipaxegiwiwuf.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/35961187252.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/rexajafegulov.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/nuvatowokujurekakowe.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/9517ea37aa7bfdf318b06fc0ddc033b3/mutalonixarilofagis.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d86ef626040f00c2b772d5bdc724acd9/xodafidu.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/2b800d53549f11cd69d2004f97b7752e/35453139921.pdfIn PDF document text
    • http://talleresjpg.es/img/file/5562361766.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/34955241672.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089cd9475230---pumexisutegidakifujof.pdfIn PDF document text

Related samples 8

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