Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64f717bbdbccdde…

MALICIOUS

PDF

91.8 KB Created: 2021-09-13 17:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 55d1977bba85572a13271a0cc70c4096 SHA-1: 96c5a507fd7200acf8853c20516be2a1b95ca71d SHA-256: c64f717bbdbccddee2888801507203bda53f13e2e3205faf63d1a145c2043bce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it is a PDF link farm pointing to compromised WordPress upload storage and disposable hosting. Embedded JavaScript streams are present, suggesting potential for further malicious activity. The numerous external URIs likely serve as lures or download locations for secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=last+day+on+earth+dead+war+mod PDF link annotation
    • https://belitour.ir/basefile/belitourir/files/fepomelivuti.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/bekavap.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/lexuzolob.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0f2bc32e9---90619581431.pdfIn PDF document text
    • http://exosushi.com/uploads/files/11986515793.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/lukokunibezazep.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134e96e0a13f---kevamowilivobukupu.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/waxodapunagiziwokaje.pdfIn PDF document text
    • http://techmechengineers.com/uploads/powexiwu.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/92912077032.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/72891833125.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/venas.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/7586466612.pdfIn PDF document text
    • https://jin-ji.com/upload/files/danasodigokeb.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/wosevomodupile.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/gomunoxepa.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5db2e4d7c6b29824c2cc037e325f2e56/lurotodadebujolenu.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/73375531901.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/nerugadonosoxo.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/97075852917.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/rilimiwexagibik.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/gididutifatu.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210901_22EE9D2682CD9BA0.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/xoxewi.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_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 10532 bytes
SHA-256: 3d66bc2d6c44257486de530aec3f4d0f31e3f2e8bf2b92f50198808a63456e27
font_02_sfnt_off000133a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A8 17692 bytes
SHA-256: 0c65273a394f445c08c3e5cf279e851e2ef12a05d08f9d229699ad6728cf7929

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