PDF malware analysis — malicious · 2709993bb6159342

MALICIOUS

PDF

94.4 KB Created: 2021-08-19 21:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: f8296a56020e3bec1f6112243b5f1b2a SHA-1: 97c35108300ae7fef3ce88991242290c04b953a1 SHA-256: 2709993bb6159342f3a41db5d5cf0e582092b774f42f3ab61761b8651c988be7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to phishing or malware hosting sites. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9910

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://drafthe.ru/uplcv?utm_term=degree+verification+challan+form+gcuf PDF link annotation
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/g8fl19ckjjgoqs73f1n8b87ekd/mofumavozap.pdfIn PDF document text
- http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/20240497497.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/1gefhe0h1mhe93cchsgiimddej/66491658943.pdfIn PDF document text
- http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c43b8de98c---kidewawevikurowenike.pdfIn PDF document text
- https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a1da52bff36823723c96eacf87991c89/65713803047.pdfIn PDF document text
- https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/4b3ig6ngvrrgpijl1sriovn57f/14109952600.pdfIn PDF document text
- https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/knv22v5kskdt3fnvf9tmgtsfcj/wedulavew.pdfIn PDF document text
- http://ketnoikienthuc.com/upload/files/30440970312.pdfIn PDF document text
- http://www.naturhalles.fr/fckeditor/userfiles/file/48842759642.pdfIn PDF document text
- http://cadelupo.it/userfiles/files/gevumakevogenuluz.pdfIn PDF document text
- http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b0eb6edb---tafosisuloguxinu.pdfIn PDF document text
- http://zae.me/datafiles/file/fadekuvaxire.pdfIn PDF document text
- http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efda090a81---84004062773.pdfIn PDF document text
- http://baracenter.be/userfiles/file/13372420136.pdfIn PDF document text
- http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16119b0dbdf4f3---dasos.pdfIn PDF document text
- https://goldenapp.net/file/tomugevodikakuluzafamumev.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ee6ebe7b136565a47ee33875f3e79350/sifidinumiz.pdfIn PDF document text
- https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/76557559243.pdfIn PDF document text
- https://autoandtruckrepair.net/nbloom/fckuploads/file/5994091198.pdfIn PDF document text
- https://poolpoint.be/uploads/file/najagobibokunenasi.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f8bdb4947---zuvanupikidilap.pdfIn PDF document text
- http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16092290569383---72040342902.pdfIn PDF document text
- https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/3f4750ab862286eb706fb1e62ee2268f/47021937878.pdfIn PDF document text
- https://bwawarszawa.pl/upload/file/76112157302.pdfIn PDF document text
- http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/08a79663c716b11a2c8d4fc52a740fba/42011161271.pdfIn PDF document text
- https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1d4ae2cadbd56276d36449cbc354b0e5/97537623853.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f0a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0A2	17228 bytes
SHA-256: `07ef175b0b1e491ec8c0a8b542f5f16ee8c7bd5eaa3fe3bfda87b26f2792ae41`
`font_01_sfnt_off00010a36.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A36	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001224d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1224D	10784 bytes
SHA-256: `537c5982a67cfdc2c58ba24898822fa001080425c2112bf471c89791f5d7e505`
`font_03_sfnt_off00013af1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13AF1	17716 bytes
SHA-256: `81b029d191bf5ea125678b70a7472da68bd1081854db9c9ad950f843cfc9955c`

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