PDF malware analysis — malicious · 84d8e1b865f4bbfa

MALICIOUS

PDF

37.7 KB Created: 2021-06-19 02:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23

MD5: e830fc9504dc305091555b7ec6233b67 SHA-1: 90f637d551cbbfd70a4c51b4d38a19bfa1d5a2c5 SHA-256: 84d8e1b865f4bbfa013dde07c92cf3d4a84c31e70bfd1ac6e04d63e58eb7eae8

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 0.9289

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://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608515a6182f3---bitafidit.pdf In PDF document text
- https://burstallconrad.com/editor_files/file/pupotilepibo.pdfIn PDF document text
- http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/11vpqvait9d8f6226ccddg1ci7/zijaximivamid.pdfIn PDF document text
- https://alzubidi.com/userfiles/files/difubovobuvig.pdfIn PDF document text
- http://fitnessklub-impuls.pl/uploads/assets/file/dasulifexanofokevajadab.pdfIn PDF document text
- http://animalscipublisher.com/files/upfiles/file/1632291811.pdfIn PDF document text
- http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/59119080570.pdfIn PDF document text
- https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160947440958d2---kowerenefojaronipida.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0a8130687---63577459130.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=rufus+install+windowsPDF link annotation

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