PDF malware analysis — malicious · c658611082d10fec

MALICIOUS

PDF

88.6 KB Created: 2021-07-02 14:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: ca9bd7ba94f72f7ea36a5f6eb041ec99 SHA-1: f6b3de7d89e03433cb06413559100797e014aa02 SHA-256: c658611082d10fec76deb89ffcc5172330b300936b305b85f280414d2e31a03c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF's structure and embedded links indicate it is designed to redirect users to potentially harmful external content.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=how+to+increase+oxygen+level+of+body PDF link annotation
- https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/d6430345c3680e95ea4346b7c081bc0a/nerimidomerajajijanuma.pdfIn PDF document text
- https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/e6b404f87a3d2dab463e40b7cbf48d97/1976418031.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c56f53ea79b---23537140343.pdfIn PDF document text
- https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/59988ee4d2e4aac35d646c049923dbe6/vubojewukotewumi.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac8dd73b65---79568082105.pdfIn PDF document text
- http://smart-ventures.ch/upload/Editor_Images/files/40682726547.pdfIn PDF document text
- http://abwpetersburg.com/uploads/files/76186389241.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/dfeulj8fmdeci17md3ftmd6c56/kemeketedexesekivow.pdfIn PDF document text
- http://enotecagaribaldi.it/userfiles/files/kotanalixuwidufuxapala.pdfIn PDF document text
- http://ateliergermain.net/sites/default/files/file/nuzewabadiradimevawovukit.pdfIn PDF document text
- http://biotledlight.com/userfiles/file///21271597050.pdfIn PDF document text
- https://doellefjelde-mussemarked.dk/images/newsmail/file/selizesibibutazizu.pdfIn PDF document text
- https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607425d4c539f---lejobozotitezinigodo.pdfIn PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28b779c7b3---dujitiviriz.pdfIn PDF document text
- https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/619def28c2f35c8e0204c90a1b4fb825/15367886297.pdfIn PDF document text
- https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/5o8bntr63ec4jrrg574buhkl95/65137997879.pdfIn PDF document text
- https://badoza.net/userfiles/file/46689499748.pdfIn PDF document text
- https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c788d82334b---sijudegat.pdfIn PDF document text
- http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/jejib.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ebf1793a8b0084eb313e6eac7e9cd2f9/28039922821.pdfIn PDF document text
- https://petrovsky14.ru/docs/files/79982357635.pdfIn PDF document text
- https://mn-lawfirm.com/box/userfiles/file/74190027029.pdfIn PDF document text
- https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/per7s56mkku811hioei2ofr869/8196269775.pdfIn PDF document text
- http://ferramentabelleggia.it/public/file/titegejejofef.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608041acefd5f---vibagexuwafad.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_off0000f79e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF79E	16632 bytes
SHA-256: `56eb9dd154f186e4a3b0107d732ff9d774d32dd668565a4cbfa5a85fe77bcacc`
`font_01_sfnt_off000122cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122CD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013ae4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13AE4	11148 bytes
SHA-256: `f22fc9718d740f1b67c3918ca609e184a4a0b49b7da6219cb06b308a1e1d2d19`

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