Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7deb26be5d1e21…

MALICIOUS

PDF

120.3 KB Created: 2021-07-13 16:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 30a9a527f085ca8d062ba1c5d23aa976 SHA-1: 576820a6db926f655d797f2ba7da4e40b79f9c22 SHA-256: 1d7deb26be5d1e215e537f0dbe5f8d9b97b64f4d78b584f15583a4139b395bbe
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=dna+polymerase+3+holoenzyme+possess PDF link annotation
    • http://majorpropertygroup.com/userfiles/files/39498620615.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/34ce5fc89f1327c611a152207f33f651/tanemogu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1df445ec3---katojelekavabinutevamo.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/13514833187.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc9dcc2cfc---33550209583.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/3mg1mvae14jc9ho888183skhmf/13460122024.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/87388086273.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160835597b599a---titeredavanobulerubusile.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079067ee1efd---48495557164.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160919680c54b8---bofewudedepiregupej.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5f061136b0f2c3255534df42227900cb/9019939995.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/d5gv6878s3f2fd1kn7sm5jmcef/14924796819.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/krbmq8d0log9n73r6t17lid5io/88689979949.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a8639236f98fbcdafacaa72d52441c3c/91824487160.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/ginavip.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/pesivuna.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/73804494992.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df97cfdd8eb---50034019556.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1mpop9l31cnf20lfl59l95utha/46909297697.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/mopotenejesususip.pdfIn PDF document text
    • https://samowar.ch/upload/file/zesowu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838b3d010b3---fakatusokazuvokupa.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.

FilenameKindSourceSize
font_00_sfnt_off00016fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FDA 19320 bytes
SHA-256: 9d1194bff9e73539de094b30314ff2df89c06279bf6ce9af922df3df3e4bd5bc
font_01_sfnt_off0001a34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB62 10676 bytes
SHA-256: d3f688b910582a98af46336a178d9149d5e5b1d1593190b6d555ff26cfa0386f

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