Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbd7a0f9cace0ef…

MALICIOUS

PDF

78.0 KB Created: 2021-06-09 00:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7903501669d7d6d5ffe45f0835497168 SHA-1: 73f885d27622174dc91068311f926057b6e3a296 SHA-256: 7fbd7a0f9cace0ef50253dcc8b667f281f4bb7988e08bc51ffcd98a518326b74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple disposable hosting domains, likely intended to trick users into downloading further malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=lying+sam+harris+pdf+download
    • http://alituncer.com/userfiles/file/56109311005.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607014248bdea---kunujorofibesiz.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/19lg1h9f9ptujdjd6khdcbmcbi/xojopupifukumofara.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096885e29a1e---22114367856.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b277df181b---49244881734.pdf
    • http://nbpcpentecostalchurch.com/clients/65183/File/tarojigidalejixilugab.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/8nimnrclv49djub3bs80ejhmqr/niwibaxatebutogisozizakaz.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160962747245a6---80618985510.pdf
    • http://akkoryazilim.com/userfiles/file/kulugaxozefaw.pdf
    • https://red-adlay.com/upload/files/32537948191.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609869cc1517b---zopozewororaxulurijiz.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774ddb13fd7---14631537880.pdf
    • http://candientushinko.com/images/file/tenonopifugo.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/47v8qd2on5dbb6ft3kci5jel7q/91822381988.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/a91f75330314e3d51a7245a7d3ea50b1/ruvesivamuf.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607745b196a75---dukifunos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1fa.bin
333dea2841a34239be6d7e0191449b95614466488ca89299d0e331a88b171306		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 5592 bytes
font_01_sfnt_off000104fa.bin
c873f82c3a080e82c603fb47a950936ee209da95632d20381174b59c6ab4b97c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 11464 bytes

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