Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68e478fdff2d26d…

MALICIOUS

PDF

89.4 KB Created: 2021-06-25 18:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dba0fb7a584943a189356c15dd009a39 SHA-1: 8e8f2c7bc2834ab1bce9d6c0245b161e8964c1b7 SHA-256: a68e478fdff2d26d64b28b11c6d7b3ed1a44a9270f027633919f02cb8f431d7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cructi.ru/uplcv?utm_term=15+important+bible+verses+about+interracial+marriage
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072007d4964c---fivevunibipezelagemif.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/n2uu82l6n87la6u8hb5iep3p35/befokezezupirivadimomip.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/455c053d586f8a667d4128c5f3015575/gizezemapagatosozupilifad.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/7vq106f9kdehfiid51ec4klm54/taxapomibozatumufuzaj.pdf
    • https://allmassage.net/upload/file/20210519035523.pdf
    • http://centralgiving.com/media/userfiles/file/lukigemekasizigufafit.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f949b98b---kazomowiboruluwikifix.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/902c7dbd698d0d397eca655de6d8c8dd/98935711772.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc48e06b71---10775228735.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/jakofugagaminetekimew.pdf
    • http://kovacsoltvaskerites.hu/images/file/gurobode.pdf
    • http://phuwangnam.com/user_file/file/dokubomosuxudapula.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/a9e1a58c3e86f519ed05873305e29c7d/puseginikusudagilebaxit.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609002718ce0c---79553230096.pdf
    • http://tydafa.com/dafa/uploadfiles/20210622134349.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b102d3b58e3bc019de28fe99b27da0a2/27170097352.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/h90ee5r6tbfs16p3tdiurgkfln/xagotibipubezisakimu.pdf
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/10529288901.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/su99okuq2mugvbrkbjv4qnfuf7/55155273384.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/mdhjs6lodjk0pkubmi3hif1ts4/texudosejav.pdf
    • http://alhouti.com/userfiles/file/jobejitopazidonanidow.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3de6c8ffcea50b64f1ee2016b074bcc3/betiwamafuvugibodudasigo.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/75214411345.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8b8004670---sizeliwugutizadadim.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/feqac93744gnu1d7p7q98rp711/latazejepuvobasijot.pdf
    • https://nguyenthelong.net/userfiles/files/98810341778.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f96c.bin
8c42720dc3673ea2e12fea625d4db3f4e08990a7a53589d5c2e37edeba19fceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 17144 bytes
font_01_sfnt_off00012628.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 16792 bytes
font_02_sfnt_off00013e3f.bin
1cdf145c144103fa570705c575ac10716e11b7d85876f2762b5d10331e4b6478		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3F 11112 bytes

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