PDF malware analysis — malicious · 44516bc3077c2cde

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 10:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 6567b36b8513b9cafab4d49e5691bede SHA-1: bfda3b9f0be28ac2b8549f29ceeca90fe843f681 SHA-256: 44516bc3077c2cde325e1a409acc3357b9995e53aca58530d1c66e23d05b7a50

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The 'wkhtmltopdf' authoring application and the nature of the URLs indicate a potential phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=large+games+for+android PDF link annotation
- http://baihsad.com/userfiles/files/20210918_041229.pdfIn PDF document text
- http://predit.ru/admin/ckfinder/userfiles/files/12159215431.pdfIn PDF document text
- http://hotechike.com/files/files/zafakudedesab.pdfIn PDF document text
- http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613010d32824a---33164934732.pdfIn PDF document text
- https://hetodon.com/fckeditorfiles/file/fijivamezoxudafotonexep.pdfIn PDF document text
- http://radio-salsa.fr/php/rs/filesupload/file/bigetodixuzobapowosusij.pdfIn PDF document text
- http://greensquares.in/userfiles/file///pekobota.pdfIn PDF document text
- https://unifor975.ca/userfiles/file/nimefevonanosufuwaxug.pdfIn PDF document text
- https://bk.knu.ac.kr/ckfinder/userfiles/files/wuwonivob.pdfIn PDF document text
- http://prttour.ca/FileData/ckfinder/files/20210917_E13D45F327D0A695.pdfIn PDF document text
- http://abwessex.com/uploads/files/33009286566.pdfIn PDF document text
- http://kolbiko.com/images/uploads/file/76127313047.pdfIn PDF document text
- http://togclick.com/media/userFckfiles/file/82101530106.pdfIn PDF document text
- http://clinicaveterinariasangiacomo.it/userfiles/files/87071372024.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613328b058e12---3919031234.pdfIn PDF document text
- https://viktorina.ledoritulys.lt/files/gozobonorabitofod.pdfIn PDF document text
- https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614558419f4ca---7078470862.pdfIn PDF document text
- https://yantrasearch.com/ckfinder/userfiles/files/33407744292.pdfIn PDF document text
- https://tennis94.fr/img/pics/files/64422919926.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/qmjn3760mch1cr9r5vrqm1iel6/93498292165.pdfIn PDF document text
- https://geneolock.com/ckfinder/userfiles/files/mafitokobisaved.pdfIn PDF document text
- http://themetamorphoseprogram.com/userfiles/file/82795495972.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3421122c7---fajuluvogexodebo.pdfIn PDF document text
- http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/paxudi.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_off0000df88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF88	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f79f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF79F	10512 bytes
SHA-256: `578782f963c4c212347eabae4a4da09d57dca89872a1b950d9d846aa22371e9f`
`font_02_sfnt_off00010f42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F42	17364 bytes
SHA-256: `5cc1ae4558cf0aad00c889ebbfc24130186be9493d6b3a8d9942de583409c580`

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