PDF malware analysis — malicious · 2a5a0b727fd796e0

MALICIOUS

PDF

81.1 KB Created: 2021-07-06 22:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: cf215e284b1abf493d9cd0e260930cfc SHA-1: e1ac854a88e63b927500ab3d47b7b4ab56f34cd2 SHA-256: 2a5a0b727fd796e04f70d3ecde3d4998d058e630ee5a130a7c1e0a52465e9619

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, and a link farm structure designed to redirect users to external sites. The presence of embedded URLs and the overall link farm heuristic suggest an attempt to direct users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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://infrive.ru/uplcv?utm_term=lords+mobile+8+9+elite PDF link annotation
- https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607735cfb168a---sozupumifuweduxifalex.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9e60e9a6---jedutirolomoman.pdfIn PDF document text
- http://bsp-oblspl.org/ckfinder/userfiles/files/danozika.pdfIn PDF document text
- https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/290332cebba2611d367414a39a0fa602/21645039319.pdfIn PDF document text
- http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077c173a3a88---mumafomoku.pdfIn PDF document text
- http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/damaraporav.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070be528f744---93545829443.pdfIn PDF document text
- http://kadh.kr/bobod/upload/file/81589947216.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfadcd7435b---89415737530.pdfIn PDF document text
- http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/jafudewixifukepul.pdfIn PDF document text
- http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160939e1cd4fc3---71649435707.pdfIn PDF document text
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/cd1t52c1qlmioge4sehr12uk33/48970466043.pdfIn PDF document text
- https://hocngoaingu123.com/upload/files/90273861725.pdfIn PDF document text
- https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/fa2aa37917ab542a16176bcd03f64434/zifugex.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_off0000dc1b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC1B	10616 bytes
SHA-256: `126a297496bdd5aeac390b519a802696959d3c31265b44ee716a1374c8da984b`
`font_01_sfnt_off0000f45d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF45D	16696 bytes
SHA-256: `d8f375caae163006da5bccce3beb7b7ce1e234fce2a93804077875479a98f962`
`font_02_sfnt_off00011fb6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FB6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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