Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa225aba922d61c…

MALICIOUS

PDF

86.9 KB Created: 2021-08-09 04:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8a9b5dcf15f3a7fe48c2dfed583ec450 SHA-1: b7a4744093053fd9762f4eac91d5ae59a4f45b5a SHA-256: 4fa225aba922d61c02a184f21b271eda27f186d823ba33348225c7d6ce36a14c
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users into phishing scams or download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://catamma.ru/uplcv?utm_term=exercicios+de+ingles+com+verbo+to+be+para+6+ano PDF link annotation
    • https://gs-hemeringen.de/ablage/userfiles/files/85126241282.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/e05e17efcf639508c1315fd1e344d157/xukorobagofiwikexaj.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/g6uqu26csutco2ku1dk5btb0r0/gusidajetiboj.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076041856a99---64570462138.pdfIn PDF document text
    • http://sdds.be/userfiles/file/48398453691.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/robezepovesamoloxawuxebom.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863f508e03f---fiwalawuw.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/g0gpq45vurur8dldd3q0r752f0/luzusaraxoxojufibodija.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082b2db340d3---57960269980.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/70860009726.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/pbpjdntojv9bdig2lgrsk79d5j/vagefubawojuxuxivakoxukez.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f6e74eca1---3624485964.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/sgtq8csijr2gdtl8dv3vtvk6vd/68072330674.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/92878210383.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b989f182602---lakidixa.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/70295566774.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/wowiwaponexisedozidegigud.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/36585794910.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/fojaganinokaxejafus.pdfIn PDF document text
    • http://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/xosigifig.pdfIn PDF document text
    • http://zuche0551.com/upload/file/xulalamitetidoki.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_off0000e8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 20100 bytes
SHA-256: e072294c931aae2f36b53506069e570e57111e3774af2ba1241b03585848e326
font_01_sfnt_off000119fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13213 11316 bytes
SHA-256: e944eef52cc262b06b966a7626db53f02881203cbc683e833cc184bfdf15f7ae

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