Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82dc04ed996d417…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 08:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6871738dae9c52decf8fe1f7448eb8b7 SHA-1: 59c22da94b1c5f0da077722e91d664dbd807f106 SHA-256: f82dc04ed996d4176f7f77e5b422ad39e6c0e907a5b5d56aa1441523077e53f1
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 numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The `utm_term` parameter in one URL indicates a potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=compare+and+contrast+ios+and+android PDF link annotation
    • https://happen.webasl.com/userfiles/file/toneko.pdfIn PDF document text
    • https://anesaportugal.org/upload/file/kavulawedulevuxukuxoved.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/s915bej5bpvf4cou5l8cghdc0v/10811705245.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613337d1a6a14---nipuvuzobujinir.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/nalep.pdfIn PDF document text
    • https://kiptep.ru/file/kofusabuborikarog.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/19298998990.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/e6a5e317693384a46110ebd7cd2bdf26/vovemifuxeje.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/dubapu.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/nenavozisogupeva.pdfIn PDF document text
    • https://nyig.com/files/file/25135481049.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/jarafalogutepasedivi.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/tepixeleferuvavawado.pdfIn PDF document text
    • http://geodez.com/pliki/file/13602071836.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/lekofosifubiloxoze.pdfIn PDF document text
    • http://ty-int.com/files/files/bepojelujifin.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/bisegufi.pdfIn PDF document text
    • http://ternovykh.ru/content/file/gedirotepenuxudugetov.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16144fea7a361b---mudikuwuwogenaragizul.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a29041226e---nepura.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/petokukofabiwuf.pdfIn PDF document text
    • http://goref.ru/files/file/46082446397.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_off0000ad71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD71 15540 bytes
SHA-256: efc6d90fc4049c14e6da515b2e3e6b9c37804f8898040e7eb54c4810828200af
font_01_sfnt_off0000d4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 10660 bytes
SHA-256: eb887cb7d3073918a1d2248ee90acf35810d4f7771222e522ebfbc9313a9d126
font_02_sfnt_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1