PDF malware analysis — malicious · 6bfc7551f1e8d880

MALICIOUS

PDF

90.0 KB Created: 2021-07-14 08:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 4608d8cac9d30c76b671a9e19f6c36c9 SHA-1: 1e0e44b664498405f9105fe30071539fb3b5c7b4 SHA-256: 6bfc7551f1e8d8808b9e472fdd77ab067bd5dbabe4b02ce88fd7bfd7f2c3a318

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan. It contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown-reputation URLs support this phishing and malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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://crewmak.ru/uplcv?utm_term=download+iso+office+2019 PDF link annotation
- https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f658083666---57656551678.pdfIn PDF document text
- https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/00b0ddcdc9753140c17403104fe1ce4b/29029027058.pdfIn PDF document text
- http://acudrved.com/ckfinder/userfiles/files/36796373559.pdfIn PDF document text
- http://chemicalengineers.ie/images/vakodaroz.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/210505c4992b7ddb332389876ed4aa81/4955932586.pdfIn PDF document text
- https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607323569ea5a---14918483215.pdfIn PDF document text
- http://yoron.net/up/files/32963647069.pdfIn PDF document text
- http://ahsaipu.com/v15/Upload/file/2021513654205070.pdfIn PDF document text
- http://goodwill.pl/userfiles/file/28558800753.pdfIn PDF document text
- https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/712661d4246466573bf3eea4952c8927/gutimafibupajosoxi.pdfIn PDF document text
- https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/bad189898d8a1837bca3ac66dd62e605/37065780879.pdfIn PDF document text
- http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d36fe4c3ade---48595158356.pdfIn PDF document text
- https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ccb93c6aebb27f1949881cf73d35be8/sewubeterilofavid.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c45ded7463e---9721978894.pdfIn PDF document text
- https://acrgroup.nl/userfiles/file/wusafetojox.pdfIn PDF document text
- https://parokisantolukas.org/Uploads/userfiles/files/busufomifutebizovu.pdfIn PDF document text
- http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608231774258b---83848077839.pdfIn PDF document text
- http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160941ebeefc33---vulupirezokuxuwipigofura.pdfIn PDF document text
- https://nevisnews.com/userfiles/zujapedaziwufapegagimaso.pdfIn PDF document text
- http://cecev.com/stockages/files/98421926717.pdfIn PDF document text
- https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/a5eba088727e1b13b2b8e050e92baadb/wudomedofalemi.pdfIn PDF document text
- https://almondzwealth.com/administrator/imagetemp/file/50041471921.pdfIn PDF document text
- https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/4e16129c76d752b1167f17f7b5fbc963/70268377692.pdfIn PDF document text
- http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a87e5ea5b17---36323860060.pdfIn PDF document text
- http://lateonsettay-sachs.org/userfiles/file/92047708179.pdfIn PDF document text
- http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160767d3d828e5---89117463962.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fd77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD77	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011589.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11589	16808 bytes
SHA-256: `b45c9606edd0ae6bfaa629d8b65b147fa01c35fca53848e76df8975a9e5fcfac`
`font_02_sfnt_off00014175.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14175	10820 bytes
SHA-256: `10ed5314a6f27e885c6a5abcf4c087781650810bdf9b75a4fcdc1bb60ba7a312`

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