PDF malware analysis — malicious · 0a4e02ae0c6cb9d3

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 15:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 8ae4dc017637ee3757e8a827e6c4551e SHA-1: cad5cb60057cf0fb80711cfa1df786b7a4b97420 SHA-256: 0a4e02ae0c6cb9d3d36f12ca12905ec65cea5ba5ddaa359dcc0a5e74290c9836

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://smidgel.ru/uplcv?utm_term=employer+stock+transaction+worksheet+instructions PDF link annotation
- http://sb-78.ru/files/file/nusopepamezuvuvapuv.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793eb84fa86---96902056850.pdfIn PDF document text
- http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c56bfc5872d---65836426892.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/71f841320adeed18ae6e0ae46be4c4fa/puziwuxudu.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089389354135---tarenigoxaxanawunimefez.pdfIn PDF document text
- https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/10d914a72cf64c93e62516d88d506ddd/birokomijixolewanoreka.pdfIn PDF document text
- http://bazis-expertiza.ru/ckfinder/core/connector/php/files/19191477222.pdfIn PDF document text
- http://393citizen.com/upload/files/tifepirosapir.pdfIn PDF document text
- https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c7373aacce0c102119ff3418ba42bd34/dobitumifulusiputu.pdfIn PDF document text
- http://gillsandgeckos.com/userfiles/file/38498605838.pdfIn PDF document text
- http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/nabuj.pdfIn PDF document text
- https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/lne6tfmu6d94tvg62pphnpvje3/lisurusumuwinuw.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611e54cdee4c3---60811742250.pdfIn PDF document text
- http://fine-cottage.ru/userfiles/files/73231667889.pdfIn PDF document text
- http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160763768a60dc---xovoborilulixoxuronesuzuf.pdfIn PDF document text
- https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819a6c4b9e0---12197157112.pdfIn PDF document text
- http://hajnysport.cz/FCK_userfiles/file/pisazazaxi.pdfIn PDF document text
- https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/da4f55df1763214c797b30a6dcc31898/riridefizipeli.pdfIn PDF document text
- https://cuisinescartier.ca/upload/editor/file/40318106791.pdfIn PDF document text
- https://seitonsolutions.com/ci/files/94152218781.pdfIn PDF document text
- https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/0f222f5fabcf686dd93f52d8f260a392/25201015406.pdfIn PDF document text
- http://clasesholandes.com/userfiles/file/3830714867.pdfIn PDF document text
- https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/b39gkdr7o2d9g94el65cbbokn3/21789059035.pdfIn PDF document text
- https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/iutc1d2nki440n7tcf92j598lp/pofakelijudabuzisikinow.pdfIn PDF document text
- http://centrlita.ru/archive/image/file/sabojoloborujupuki.pdfIn PDF document text
- http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074d2b03d5e5---gidokevuwagajalukamigo.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_off0000dd76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD76	11016 bytes
SHA-256: `f8d118cb546c144c4f82751309b00d03b7344f0883bcde4390ef0917954d8905`
`font_01_sfnt_off0000f6fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6FA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010f0c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F0C	17948 bytes
SHA-256: `33d5ef72f5d4848418150490a5a5aa784d6dd2673f3eecc6315f3b5e526d13c1`

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