PDF malware analysis — malicious · 665e9003625569cd

MALICIOUS

PDF

86.0 KB Created: 2021-08-09 07:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: f508bdf07ca8f7ea3a5af5b90a1cdabf SHA-1: c5e1164b7c2e48b7cf8d54178e33ca7f7ad6d6a0 SHA-256: 665e9003625569cdb5733508b0ab0b57b5064c925b874dde38453ed6cf52b80f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://medvor.ru/uplcv?utm_term=how+to+stop+hyundai+car+alarm PDF link annotation
- http://illinoislivestock.org/userfiles/file/97442794403.pdfIn PDF document text
- https://artgreen.vn/attachment/files/putomogupepoziruw.pdfIn PDF document text
- https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3305a149d---53271325920.pdfIn PDF document text
- http://atonoserver.com/userfiles/file/nolofipapotabirax.pdfIn PDF document text
- https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/d3kbd93hs6cssd7j2p93ftc867/sipolitiwigiban.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96a26362cd---renujizasotibudu.pdfIn PDF document text
- https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c392e531eaf7163de459f24accf1926c/pazojamunopetujo.pdfIn PDF document text
- http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/17147109512.pdfIn PDF document text
- https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/l1kp3pjfp3rqvpc3lkbteuehuo/wigusupetategitaniw.pdfIn PDF document text
- http://chiesamadremarsala.eu/userfiles/files/96545177453.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6b09c1600ddd5eacc8cbc8b5836cd032/69857310276.pdfIn PDF document text
- https://tahubunting1.com/contents//files/zemuzosisusagofovubu.pdfIn PDF document text
- http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ada5528ce8a---pigelegojiduxidubowane.pdfIn PDF document text
- https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a7de3a8e---33038785678.pdfIn PDF document text
- http://anhbanglaw.com/userfiles/file/xukutilude.pdfIn PDF document text
- http://oodow.cn/upload/file/2106210603309845479i8ndzue6luu.pdfIn PDF document text
- https://sca-kc.net/scauserfiles/files/muveruwezan.pdfIn PDF document text
- http://aps-mes.com/files/file/lufizadudotif.pdfIn PDF document text
- http://www.verneteco.com/ckfinder/userfiles/files/baretunufuluzozugupax.pdfIn PDF document text
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608759fccd7cc---kales.pdfIn PDF document text
- http://vtaky.sk/media/file/5519845049.pdfIn PDF document text
- https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/60df858e0970ee0c4a1c66334ab8145e/fadefopesitexezugeralewez.pdfIn PDF document text
- http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/79395794254.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/7a209b0feb96c5c951c15918ebce2790/94706123180.pdfIn PDF document text
- https://banghenails.com/upload/file/tulanikigufifozog.pdfIn PDF document text
- http://busankid.com/webfiles/board/file///desolovefebekaveru.pdfIn PDF document text
- http://www.tekkoo.net/images/library/File/mevizosakufu.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_off0000ea5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA5D	17104 bytes
SHA-256: `bcbb1cdb38ff866d521ca9b4cc554449faca4106058173bb2181cc0b59e4f789`
`font_01_sfnt_off000116df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116DF	10936 bytes
SHA-256: `ed8999c27235e90a7d42b3341ad7882d768d9b78f0b5ace98081d7f30a11b494`
`font_02_sfnt_off0001300c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1300C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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