PDF malware analysis — malicious · 6a1f2be5d1d03682

MALICIOUS

PDF

62.0 KB Created: 2021-10-13 02:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 43ac5074b57e80dfd99e9f5be60874ab SHA-1: b9ddd9577c73303f5e3410b966e010c5abed90be SHA-256: 6a1f2be5d1d0368279b3d86e321130cf326fd43a9e632347bb1e0ccf945b23ec

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to direct users to external, potentially malicious, web content. The file's structure and numerous URLs suggest it is part of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.5277

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://pixomot.ru/uplcv?utm_term=pdf+picture+download PDF link annotation
- https://onderhoudnlgarantie.nl/upload/file/92690447056.pdfIn PDF document text
- http://joyearland.com/ckfinder/userfiles/files/towoditugefumedodobetof.pdfIn PDF document text
- http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/84995072701.pdfIn PDF document text
- http://techbis.pl/files/file/49024365914.pdfIn PDF document text
- http://lex-ter.ru/admin/ckfinder/userfiles/files/54537272418.pdfIn PDF document text
- https://rimsball.com/ckfinder/userfiles/files/69756495415.pdfIn PDF document text
- http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/56484820185.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/6c2467f0cd0268fbe2d585fc2eb01805/lisidoja.pdfIn PDF document text
- http://okmarin.ru/userfiles/file/9344679202.pdfIn PDF document text
- http://vngo-cc.vn/cooker/public/files/57064426169.pdfIn PDF document text
- https://assignmentmart.com/ckfinder/userfiles/files/vijutamaxizug.pdfIn PDF document text
- https://fisheaglesafaris.net/pics/user/file/64009874619.pdfIn PDF document text
- https://exam11.menapoint.com/app/webroot/upload/files/9541925447.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/3e2bf960ee317d937da5e335ab951946/jaxawigumovosol.pdfIn PDF document text
- http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/93745938891.pdfIn PDF document text
- http://herborgthailand.com/file_media/file_image/file/81372689804.pdfIn PDF document text
- http://cp-1.ru/userfiles/files/23462884016.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/epbceb5nsd24dknq5mgul8i680/14068370458.pdfIn PDF document text
- http://clearspace-design.com/CKEdit/upload/files/94800745875.pdfIn PDF document text
- https://rijst.nu/userfiles/file/96612722653.pdfIn PDF document text
- https://hockeymro.ca/docs/file/divubujerukijimizo.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f0d6a2d4e35c548f41faf48936645a73/86954785244.pdfIn PDF document text
- http://autosvilar.com/uploads/ckfinder/files/kejup.pdfIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bf75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBF75	10632 bytes
SHA-256: `6a78f95dd91c81cdbdfb9a19d8230989a17a00dcf94187da2fe5c30e287438c7`
`font_01_sfnt_off0000d7f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7F2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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