PDF malware analysis — malicious · 6fb01dd7e83a0a17

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 17:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 4636c141ee82a54f9f8f0b3d8bfc2ce8 SHA-1: c1088fbf61e6717f21fe7db80ddc31f8e3025e07 SHA-256: 6fb01dd7e83a0a17713d2ea2503fb707e4a527e49d73519749067e9e2e3be6cf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of multiple 'formcraft' and 'ckfinder' upload paths suggests a pattern of exploiting vulnerable web applications for hosting malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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
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://garglob.ru/uplcv?utm_term=scabies+pathophysiology+pdf PDF link annotation
- http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160833a2ec95d0---62625255564.pdfIn PDF document text
- https://bda.ch/ckfinder/userfiles/files/wufaloketagaxuvaxowu.pdfIn PDF document text
- https://eksiliotomotiv.com/upload/ckfinder/files/56517746337.pdfIn PDF document text
- https://serwisnawigacji.pl/userfiles/file/85382026975.pdfIn PDF document text
- https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083a22a8581c---xulinedanuzi.pdfIn PDF document text
- https://giridhareye.org/ckfinder/userfiles/files/47099669111.pdfIn PDF document text
- http://tayles.com/uploaded/niwojusitivonamodo.pdfIn PDF document text
- https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/fc4942350c3952d89db9f1e0c8f9f61a/junorobebofuwapalavekufi.pdfIn PDF document text
- https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721701361c8---30184290185.pdfIn PDF document text
- http://caratow.eu/userfiles/file/78520033633.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a879dbde5---73434372795.pdfIn PDF document text
- http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/vorafosegezapopo.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611c1ceb26e43---kejadujogozofipa.pdfIn PDF document text
- http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2e30615ad---89151770081.pdfIn PDF document text
- https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fcf05fd61af26afd5092173d5a6e590a/zimimavorawemaru.pdfIn PDF document text
- https://kermoulin.com/userfiles/file/zufedul.pdfIn PDF document text
- https://huangs.tw/uploads/files/202109040004411045.pdfIn PDF document text
- https://digireg.sk/upload/savigejirone.pdfIn PDF document text
- https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/qpdava1be1db85ia7ub0bhd9dg/45815258185.pdfIn PDF document text
- http://niezapominajkowo.eu/userfiles/file/70274142559.pdfIn PDF document text
- http://yishiweb.com/upfiles/files/20210822_050604.pdfIn PDF document text
- http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ddf7e4ec8---rigufetev.pdfIn PDF document text
- http://heureka-cz.eu/files/95163204575.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/675bcd522607cbc0a03cdae5e40a8dca/82543346060.pdfIn PDF document text
- http://www.aportecnica.com/imagenes/editor/file/52599686294.pdfIn PDF document text
- http://aftckwt.com/uploads/file/lufuw.pdfIn PDF document text
- http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/57395018163.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_off0000def4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEF4	15988 bytes
SHA-256: `628ecd0167e23e7936e26f1b8ec22410d08a8dd35624dc0ccb33459d01b10fc3`
`font_01_sfnt_off00010773.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10773	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011f8a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F8A	11024 bytes
SHA-256: `f868b7aaa0b36e6acc73d077a90b89e2d95ffcc029d5795583de04a75df44bcc`

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