PDF malware analysis — malicious · 3c6b6a9a03437d86

MALICIOUS

PDF

84.8 KB Created: 2021-07-17 20:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 939aa623dd692f00e1701975da423982 SHA-1: 989be92f471f3920f5bfa3bf42328b1c630a4b72 SHA-256: 3c6b6a9a03437d863123290e74b037bbbeda4ac9883341b10ca834db54ca4ba3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to malicious or compromised external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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 http://veterina-hrib.cz/user-uploads/files/39973734173.pdf In PDF document text
- http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/wavepojitef.pdfIn PDF document text
- https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de9cb08e65e---laxulaxedigazebukotape.pdfIn PDF document text
- http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086cc14106bb---12471513042.pdfIn PDF document text
- http://ezibra.pl/upload//file/70318287056.pdfIn PDF document text
- https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b08daacd70b---viforalikugadozezubifur.pdfIn PDF document text
- http://euredit-editions.com/userfiles/file/21724036456.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607594933e274---jafaxadalam.pdfIn PDF document text
- http://paoladebenedetti.eu/userfiles/files/8595825825.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b1ec164033e96456706ebdc52eeab825/7747227711.pdfIn PDF document text
- http://groupkaishan.com/d/files/nagovunixivowavuku.pdfIn PDF document text
- https://angkortaxiservice.com/userfiles/file/jitinokuxup.pdfIn PDF document text
- https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609106e9d365f---xuwitifevaribif.pdfIn PDF document text
- http://manajrgvaaradhi.com/cms-uploads/files/putaxarijevupazul.pdfIn PDF document text
- http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa6884bfe0---gululaxida.pdfIn PDF document text
- https://nguyenhungstone.com/uploads/image/files/nijakiwijexoma.pdfIn PDF document text
- https://diaochue.vn/userfiles/file/44081637178.pdfIn PDF document text
- https://geneolock.com/locktactyuma/userfiles/file/15653915725.pdfIn PDF document text
- https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9483f5f3eae4b5fc41d8dfdfcead4e92/semutabuv.pdfIn PDF document text
- https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2cd436de5b54a48b3a194bc2f347716e/60234370521.pdfIn PDF document text
- http://edanieltour.com/FileData/ckfinder/files/20210624_A115D69BCF7EA795.pdfIn PDF document text
- http://art-lan.ru/uploads/assets/file/likeruxebetopabazok.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/bumupawazirisal.pdfIn PDF document text
- https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160909904c07c3---54970075629.pdfIn PDF document text
- http://abc-tel.ru/data/File/nagulegaribe.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=strong+willed+two+year+oldPDF link annotation
- http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5d64b5286---fofozavenepupowexomotudat.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_off0000ea25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA25	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001023c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1023C	10528 bytes
SHA-256: `75e5182584d56c6e7291393c0fc5fd3912362163ac3b2cfce427ccfa56d64ece`
`font_02_sfnt_off00011a2e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A2E	16680 bytes
SHA-256: `ed3e7c826170015aa9ff7a1fac915183132675e6aeac701221ab2e51c0dd8626`

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