PDF malware analysis — malicious · 53ed8100b85c8154

MALICIOUS

PDF

37.3 KB Created: 2021-09-04 16:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: a1ffa866ec5dbf607998b7986a8b651e SHA-1: 52080a3b7018607d747178d1a636e497cb5fe255 SHA-256: 53ed8100b85c815426fa97ba38ab8bd36bb192202d4cb42483c7efbe1bf2dab8

174 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF is identified as a phishing lure due to its image-only content and embedded links pointing to compromised WordPress upload directories. The document's structure and the presence of multiple external URIs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.6667

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 37 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://cructi.ru/uplcv?utm_term=harmonic+analysis+music+pdf PDF link annotation
- https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/tm7oljejvqaqiothflee7a11ie/24643465302.pdfIn PDF document text
- https://mama-light.net/business_school/uploads/file/93213020052.pdfIn PDF document text
- https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dca2d33847---junune.pdfIn PDF document text
- http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/rifekugobofanumifamezedok.pdfIn PDF document text
- http://zs-oilfieldequip.ru/d/files/58630887453.pdfIn PDF document text
- https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1f086eff4b570e83c5b1e57f222b83a8/zixomi.pdfIn PDF document text
- http://basyapiemlak.com/yukleme_klasoru/userfiles/file/34579308957.pdfIn PDF document text
- https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c374b720212b2b9af0196859af4c5ab2/46678847012.pdfIn PDF document text

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