PDF malware analysis — malicious · c2bc267c79449631

MALICIOUS

PDF

92.3 KB Created: 2021-09-02 23:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 86978b534ab74193b57273c18debcbef SHA-1: f0562cd7bcb0f2d171d2f723c713230b6c4d8c3d SHA-256: c2bc267c79449631062a8f79ef6ac8789c7f4fc5618775a3cb21317dc1366f15

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

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://irlanc.ru/uplcv?utm_term=pdf+extract+images+poppler PDF link annotation
- http://beiwendq.com//data/attachment/file/65842757193.pdfIn PDF document text
- http://onfireinteriors.com/userfiles/77704040044.pdfIn PDF document text
- https://aitalk.vn/upload/files/wixozasuvijuz.pdfIn PDF document text
- https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/palugigopu.pdfIn PDF document text
- https://hondamienbac.vn/userfiles/file/57457335177.pdfIn PDF document text
- http://kamkmori.cz/ckfinder/userfiles/files/zinonugovabulibe.pdfIn PDF document text
- https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/fdgpn2rkifodn51g51f4arpdiu/28831154337.pdfIn PDF document text
- http://yuanda-boiler.com/d/files/xunefonojesetin.pdfIn PDF document text
- http://yfatc.com/userfiles/file/85138165024.pdfIn PDF document text
- http://joy05.com/_UploadFile/Images/file/13076327580.pdfIn PDF document text
- http://sattosushi.com/uploads/files/puvovewumuxexawole.pdfIn PDF document text
- https://bakwanudang.com/contents//files/82612899131.pdfIn PDF document text
- http://busankid.com/webfiles/board/file///9853777144.pdfIn PDF document text
- https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/8f8032417252d2a348426df34d4aa92c/38827225124.pdfIn PDF document text
- http://pluimveebeurs.com/userfiles/file/wusesoxun.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef8616f64---85973093612.pdfIn PDF document text
- https://niboparis.com/upload/fckeditor/files/vegenojid.pdfIn PDF document text
- http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/85061340343.pdfIn PDF document text
- https://binarbaidtrading.com/public_html/userfiles/file/61911840351.pdfIn PDF document text
- http://yachtandgulet.com/userfiles/file/bumasuzugetitelegebi.pdfIn PDF document text
- http://infinity-pro.ru/userfiles/file/74879249143.pdfIn PDF document text
- https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f92f72f18---29048482370.pdfIn PDF document text
- http://innersolutions-uk.com/file/basatudubit.pdfIn PDF document text
- https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160beadbe2ba08---23899140843.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_off0000fee0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEE0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000116f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116F2	19280 bytes
SHA-256: `cb2f8e2137f3b48d4c6368d4e0384ce9977f04810cdaf04d9753512c32cc74c6`
`font_02_sfnt_off00014a58.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14A58	10964 bytes
SHA-256: `e24494bea62171d02cdef24a251924f8a94584470f908407902b104a19bf8da5`

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