Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6484cb8dd3f037…

MALICIOUS

PDF

90.1 KB Created: 2021-08-04 12:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: afe357c7419e3bbff2750b0c53df06c7 SHA-1: 0fa37593d357b1f09d9235bd4d3509e477d03a83 SHA-256: aa6484cb8dd3f037cd7031af071a69ee178c91887573ac59564327b82e9e2df2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=anteproyectos+de+investigaci%C3%B3n+elaborados+pdf PDF link annotation
    • http://dpengineers.info/admin/userfiles/file/lobiwomozarepadagavipejo.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87d9b60d6e---pavuwobigadajorinif.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/febibiwipaxosodemijibogaj.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44fb42ba86---93113276108.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/7123638701.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d2e207416---fevix.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/13595763311.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ed86b4ce883857594fa39ef705edc477/fetipuv.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d52c285075f79596a766d1c7fa98c749/zipizuluzo.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/savuka.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607596c61f750---41495044600.pdfIn PDF document text
    • http://zzquansu.cn/d/files/81291870404.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d6f6f3029---44399908691.pdfIn PDF document text
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/89407424018.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/fixipurudosujiguzabipo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e016c148f08c9c73ed06382eb25415ae/jenexibaw.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/xarifadofijozosetag.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c035ce9ef---15889379461.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/50fe9ad80950e18ef85cf3518521d2dd/64697852178.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/b2vcgj4a753q562tfv109nj65p/minoxojamatapofonolosas.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608963a4e5e2c---vavitulusu.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f234a41cc1aadba47e49061139b87775/51156420571.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/62643881893.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e2c5b62a9---50240008274.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_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 18568 bytes
SHA-256: 52afbb9d3a72eafb2558151515659eea723b0ed7ff7ac383b3f1d6294d1ebcdb
font_01_sfnt_off0001257c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D93 11232 bytes
SHA-256: 210641517cae5495a5f27614f7e7fe5417d8182da678f31a41f5009ebd0ca5af

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