Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b42834bd76550d…

MALICIOUS

PDF

38.7 KB Created: 2021-06-29 15:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 59754e884087f8a3846bf5d1785b1f19 SHA-1: 036315dacff08e4875708c89033e97400eb6459b SHA-256: d6b42834bd76550d09942885a9f728d3a0b51b259ef5d4ab7459595910b6941b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-only facade with a click-outward action, directing users to various external URLs, many hosted on compromised WordPress sites or disposable domains. The presence of multiple links suggests an attempt to distribute a payload or redirect to phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8588

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 38 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=double+ended+queue+in+c+using+arrays PDF link annotation
    • http://bjallstar.com/upload/file/kafarexij.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609411e95041c---4438078199.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834e5a892de---54691702174.pdfIn PDF document text
    • https://soechi.com/userfiles/file/65162761019.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/51305511957.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac549d213c3---42016336968.pdfIn PDF document text
    • https://dietacud.eu/upload/file/24723677776.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/gajibadevafabuzipaz.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/55999919320.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecba67ac3c---tifiwakoja.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/50534433186.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/deborusalerekujoleguki.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/2647688110.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096bc650a78d---kolekewema.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/pluginIn PDF document text

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