PDF malware analysis — malicious · 4f98439a71a876a3

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 17:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 6179636bc0f63c8332504d7c0b57bf5e SHA-1: 6375e1de29afa9c188d5235ab1b6661f00d1b060 SHA-256: 4f98439a71a876a3f0a180ceec66810da838194cbff3f7eaa4fd1b805f0b9ea8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=comptabilit%C3%A9+g%C3%A9n%C3%A9rale+le+grand+livre+pdf PDF link annotation
- https://pointvirgule.ca/upload/editor/file/sufifawovin.pdfIn PDF document text
- https://asthasupermarket.com/userfiles/file/kukuvivuroniwusojile.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cefc9a41b8---90803192240.pdfIn PDF document text
- http://hzdshg.com/images/upload/File/94309695647.pdfIn PDF document text
- http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609752953b294---86972962166.pdfIn PDF document text
- https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/0b4f5c02463be1fb96ba06b949595e81/82088851679.pdfIn PDF document text
- https://gameclub.by/uploads/files/67933065686.pdfIn PDF document text
- https://hanurichurch.org/ckfinder/userfiles/files/duvebijo.pdfIn PDF document text
- http://kurier48.pl/files/userfiles/file/55464150706.pdfIn PDF document text
- http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/bevamibigomedigesasomeg.pdfIn PDF document text
- https://psychologgia.pl/Upload/file/nenijir.pdfIn PDF document text
- http://www.heksan.com.pl/file/93392678469.pdfIn PDF document text
- https://megashina24.ru/files/files/51587441522.pdfIn PDF document text
- https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/05e56ac087e2afa5de2e625facb2d684/38071045246.pdfIn PDF document text
- http://wajl.net/img/file/202181611336.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb01664668---1017687115.pdfIn PDF document text
- https://nguoixunghekiev.vn/userfiles/file/99522436688.pdfIn PDF document text
- http://maility.pl/_ADRESuserfiles/file/7858775753.pdfIn PDF document text
- http://zae.me/datafiles/file/ruluzupijige.pdfIn PDF document text
- http://morebricks.com/ckfinder/userfiles/files/3744731880.pdfIn PDF document text
- http://www.ags-sib.ru/ckfinder/userfiles/files/54985457271.pdfIn PDF document text
- http://webcertain.net/contentupload/fckeditorUploads/organization_/file/jovubozotisimir.pdfIn PDF document text
- https://mcdelandes.ca/uploads/file/60431655339.pdfIn PDF document text
- http://shangrilayunnan.com/ckfinder/userfiles/files/revezugomafikara.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_off0000c9c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC9C2	17416 bytes
SHA-256: `b3b1be49988e07c08b6363415f805b665031e26e4c5368c5f014bd58a95e557c`
`font_01_sfnt_off0000f51c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF51C	11064 bytes
SHA-256: `7785fcec638e01e850e6bb9d7d0713c25e79a356f0f747ffdc4ceb12cf6ccef1`
`font_02_sfnt_off00010e28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E28	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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