Malicious PDF — malware analysis report

Static analysis result for SHA-256 f621e3ab321ce992…

MALICIOUS

PDF

92.7 KB Created: 2021-07-18 13:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 46b5cf5866e22216a196f1b886748538 SHA-1: 990e2233e3f6a9e69fa1de6b8f0346b8e6aba24f SHA-256: f621e3ab321ce992801958c168711617d85fda0bed44be4c0dc4172318847657
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content or phishing attempts. The presence of multiple links on potentially compromised sites indicates a broad attempt to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7ff2da9d57048c795fa30335fb42c4ee/budetaleduterobe.pdf In PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/aj7am27mcr18cg1nd0mdfbojap/18201385646.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/17714227000.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/46997099443.pdfIn PDF document text
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/31023005030.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9839ad382f428259f492a533ffbbcd94/80820480001.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/dawudunut.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/48963727363.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/38857652751.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/n52u5b5ue6g73loon68e6v2ks3/dizazilamutun.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/sevusagovonilized.pdfIn PDF document text
    • https://12tiga.com/contents//files/lamuregemoxabariteri.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/fv7b3368b6kj9h6e335ccraq1e/femofejibat.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/jukovumajidabowano.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a42aa43025f---40878737774.pdfIn PDF document text
    • https://activepymes.com/pub/file/vabelowijidudenunuteni.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/jadobifutewoxu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160906505db395---vagubepubenixulevu.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/51206267225.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7c4433b20755b8872a01c494e1aa1221/86104981069.pdfIn PDF document text
    • http://airbaankhubon.com/userfiles/file/zesadesesi.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f46863bb7c6c6632d2ed6200cda151aa/82164079584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=wow+visions+potionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 22388 bytes
SHA-256: 359f092f60b21942875552fb4d4ba226029958c47482ed49ab19b5b8f28901db
font_02_sfnt_off000137cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CC 16116 bytes
SHA-256: 74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084
font_03_sfnt_off00014d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D24 9948 bytes
SHA-256: fac386f41bced3a3f981e01e51d1cb7c0211b06990eb0926fbfb4311bddaecbe

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