Malicious PDF — malware analysis report

Static analysis result for SHA-256 920b9cf4e47959ac…

MALICIOUS

PDF

41.5 KB Created: 2021-09-02 15:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 178ca1e1f89a58d4f2a36cce76639484 SHA-1: b1813b6f679f3ab4c5a94434e528470f1f594338 SHA-256: 920b9cf4e47959acbe202f70dbec66b89c6c4ae897c5423aee1ee6dd47394615
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is an image-only lure, typical of phishing campaigns, containing multiple links to compromised WordPress sites and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a malicious site or download a payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8353

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
  • 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 41 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://infrive.ru/uplcv?utm_term=common+sense+celestial+navigation+pdf PDF link annotation
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/7e3jbnhvlhfc8nb3tc2uglc1g3/vakulofavurajagol.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6bb8ab1ec---goketesowigezowu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079861775c2f---tegopedudedesajetilupop.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4f46573a1---37155647863.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/c52cf1e29181e0a449d1e463b38df467/ranolepuwufisawijotetolu.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/0b6308c50ba0e8d1b32404ee92abfa01/fowexesorepuzutukit.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/wumikitaravikuwajuzomupi.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/q15vj6krberj76t3h82lceo1k0/7684608547.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/85777458231.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b05d3a6a749---vuperabomozafu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab0da2a5a6---bipakuzesomise.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/0f73a96086a64c43f8f599c1525c288c/jonil.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/rq3b6oehh28brv2np7bkgdvb60/lufakapukaroxireruk.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/babovebivolomoka.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607854e8e76f7---mivenofob.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/nutuzogosotofafotode.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/6654496635.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/c4b32c177762ee5e3aa66b8a8e1c49ad/tetakudokitosojamomomek.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef381cc336---pepawop.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/95306859995.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/6656500921.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/17917018015.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/77543509683.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/9133714174.pdfIn PDF document text