Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ece7ddbc654119…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 14:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a67c0d5f081eecaf0f5943154c60fcf0 SHA-1: 717b0e7bc5d79d8ee9cbd40abccf1ef1b3b1a182 SHA-256: 96ece7ddbc654119f39d9627d3b1d90c1f3421445915f675465a9cbb9c513dc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or phishing pages. The presence of external URIs and link farm heuristics strongly suggests this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=2016+nissan+altima+drivers+manual PDF link annotation
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/15626004332.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d04cc1751ab---famodamipo.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/nadafasajew.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/b848f0244e0864f2f6c8393cf1bd6f95/vepibuvikigovusalus.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acd262b4a48---wuzixudasamobafegusorefok.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/98056273604.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160841d9b869f2---28714447070.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/merosedilebutopum.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c843bc0b97---dupugapemenibibagalan.pdfIn PDF document text
    • http://iphysiology.ru/upload/64275591884.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/87014129618.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b14779ba777---31484008275.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d924816c---4175096606.pdfIn PDF document text
    • http://masonlegacy.org/clients/61515/File/timimimuxaw.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/82019881518.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/33436714591.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/tazirakujejunalimaza.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/34444437965.pdfIn PDF document text
    • http://msiutilities.biz/documents/leboraxugixugofugu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac55addee---89656992102.pdfIn PDF document text
    • http://candientuvibra.com/images/file/popuwulu.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/87551620368.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16083a3092d6a2---jubojizajedunexisefaxa.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_off0000beb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D0 10820 bytes
SHA-256: b106b78651cb47ac7adae03a8182e76d6d1b55e0c94833ae8a81c23717798571
font_02_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 17076 bytes
SHA-256: 3454ab3a15a61eaab526e57dd40d26e9e3d3ffec2c3319cfcabe2e9372450937

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