Malicious PDF — malware analysis report

Static analysis result for SHA-256 708ef845c0b4da75…

MALICIOUS

PDF

91.8 KB Created: 2021-07-02 10:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b056605f5b68f741a4f8158d0f7ddad8 SHA-1: b8273ac79be0b6835152c2468c1ac5638f6945f0 SHA-256: 708ef845c0b4da75fcfc0e5ebcfd1ce62c1f8b72799a71f3e35b5307510223b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate the file's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/0db3054928e44bb96e6b8e97994fabaa/bolilux.pdf In PDF document text
    • http://zs-oilfieldequip.ru/d/files/gawokaj.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/29b806e814a819eaa32d923fedeac24f/sigixikinazejawali.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c0047e529---ruxaramivawasalo.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b7cb7104d---zusoxamejoz.pdfIn PDF document text
    • http://pronobile.de/catalog/file/fesetitexosegipaki.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/jabuw.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/895f91ead33a7e6724909d14e668dd77/gedejuposupixoxiri.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/qo0j5u5n8hh8k6obuna2kvdjtd/fedoxodalusewezaj.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081c621db32b---89420631190.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086badfaa8f5---dorexelezekekax.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c910c266ac---nirane.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/pilimejamikipefefu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a761a2f8694aff2fe194100c18573275/20288501845.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/fikusevifubokatow.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/f2d7e1717834211e6e9b2e8a898beaa4/sofokawanizegifa.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/70604255863.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c09f4cbf6902ba92079b348f10da27fb/1859081080.pdfIn PDF document text
    • http://abnicum.ru/files/file/53041109993.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/juwerimepogamiwafiwin.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c7544c19---kopidubetesitovibisojeko.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090e72327d4e---85452602489.pdfIn PDF document text
    • https://aashianarealty.com/file/fujevagol.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b050854d30f---39908919795.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f33e427ea4---bozotubilabetikifowiwel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=4+types+of+polysaccharidesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 10708 bytes
SHA-256: 289589b1139e4f6cc1730d9da95e9f4e1f4d1e5b6223ca058db5a84146e5a39d
font_01_sfnt_off00011ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135ED 16840 bytes
SHA-256: 4e13f62405f0c6b3200031f445415b7515ac11b856c0c1dcd661961df36163f1

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