PDF malware analysis — malicious · 85abc1ac1928677e

MALICIOUS

PDF

37.6 KB Created: 2021-07-18 01:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01

MD5: 42d0268ea5d05950176af5f1ec2efc4d SHA-1: 42d6484bdfe9cce681fca4917cdfa13f44998e18 SHA-256: 85abc1ac1928677e0106e448daa003d7176a321d119e67f9eca17cfe4ef4aaa6

174 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.7998

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 http://kwong-cheong.com/userfiles/gipolanegozil.pdf In PDF document text
- https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/bfd21a9570ae1241799d320e6718ce51/bovufudazonepodubarujet.pdfIn PDF document text
- https://ikincielinmak.com/upload/ckfinder/files/laxixozuzanevofu.pdfIn PDF document text
- https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/976c3a0d0ce2fa1f8445d29a7a31a57b/54799227737.pdfIn PDF document text
- https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f8a34242---50211987551.pdfIn PDF document text
- http://anhuicrew.com/upload_fck/file/2021-5-21/20210521162459237308.pdfIn PDF document text
- https://baohohoanglong.com/userfiles/file/67877497202.pdfIn PDF document text
- http://matsonconstruction.net/userfiles/file/4986887092.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d7bf8a60c---523In PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=principles+of+electronic+materials+and+devices+4th+solution+chapter+3PDF link annotation

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