Malicious PDF — malware analysis report

Static analysis result for SHA-256 684574659f5001a2…

MALICIOUS

PDF

89.8 KB Created: 2021-07-19 06:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dcac0dbc2a0d0a18887832910e0b9cf2 SHA-1: cfd88d36a300a1f3659171a905a47a72e8e7038d SHA-256: 684574659f5001a2f93f3b1e68df94ffa80cfad8de152f455408e89dc2a8b159
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirects or exploit vulnerabilities, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://commsoft.nu/demo/ktb/wsmbilder/files/88456204114.pdf In PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7e7373842---panolofewijix.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/519b2f69a807e953530b7ae690f72300/dumaxuwajevixivesonolafi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bffdfb44ad8---nalitorurilumojemafot.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/u6597q834kbnvj094ah9ct3915/vililonejemazelabupodatul.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/41883140257.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/9d7d4bc96063e071560219a3e1b33977/84818543571.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/kikejiret.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/23119277227.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/julizure.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4b844ed2b8add8c028d3b81f7bb1c4ea/xofixatimufakuse.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/govewatodulabizojom.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee29b64719e---63020068708.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160878368f2fa8---xafufotirabuvogoterijina.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076575eaec52---damujas.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/sowunumadub.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/sinarovawigoj.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/86890414424.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/devosivokomin.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/ripemowegawizufojudiwu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bd04b06e6---41561128435.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/cfed46ec7522bebab8ee62aa55d186f0/zupipi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081935ae9401---68174565858.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/foveluwax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tiny+red+dots+on+skin+not+petechiaePDF link annotation
    • 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_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DE 16992 bytes
SHA-256: c5534ac1fd52e0f1cdc56517e940545248f81070ef18f8605af1c40ef11c967a
font_02_sfnt_off00014147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14147 10732 bytes
SHA-256: 2ddd0976b5b19034495dda5adb84ee74544e702ddf46573be7c79b81255e0928

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