Malicious PDF — malware analysis report

Static analysis result for SHA-256 c477102db4732813…

MALICIOUS

PDF

79.8 KB Created: 2021-07-23 22:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a589234e5ee2985ae46b4ebea1ff1a7e SHA-1: 86bac5f6d1faea108c5b7b727d51848c1984e846 SHA-256: c477102db47328135a8ee5867ff220bf47174d692893e6252ee30266b084c2d3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, containing numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://roocenter.ru/upload/file/37888400353.pdf In PDF document text
    • http://i-biohealth.com/files/89788943190.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/liwulogijivofeposazovo.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/37676553485.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/majif.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/bowenakegagunal.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/86ae0c9acb72f5d0ee37b440eb0b5c34/jisoni.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/89601331170.pdfIn PDF document text
    • http://ahchala.com/img/file/49248729246.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8a733159880a1f2b5c36577afef377d1/zawivobazisexigovazu.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/rigixogakuguvasojo.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/nadunujomul.pdfIn PDF document text
    • https://led7.ru/file/61454069901.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/b13c5390ae3c142c65fd66c605ba6ae9/19517529307.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c27bce8ea82d4fca20d2c3bd0fd15e07/pesexeduveposavibusazerow.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b866fbb342a---febufuvowuva.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc479d9d89---zimafutosirebonew.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/24937501634.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/0f2575f643b89dcd94535f224e9c287f/41407599971.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1ab69c1c---kogubebazevo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30f8ab94c---boxunos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+is+lexical+and+structural+ambiguityPDF link annotation
    • https://doi.org/10.21512/lc.v1i2.315In 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_off0000d397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD397 11148 bytes
SHA-256: bc176f0ef8a5a9be2dca8910904474742f3e239f4f93f7db59d69d02723f53ca
font_01_sfnt_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 16816 bytes
SHA-256: 46d8b24b0e786d38c13a1532adb3592486ba298de60ea239a3ee279f446c1982

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