Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e7f8f474f0ed3e…

MALICIOUS

PDF

104.8 KB Created: 2021-07-02 02:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e4528a2dbc0bb5e258f6955e08626edb SHA-1: 9873ac83ca1e58d18f8492913aeacc41343cff3c SHA-256: 88e7f8f474f0ed3ec4b4cb3abb281ea86e0cc205c6210f9007950f24407afa05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, hosting numerous URLs that point to compromised WordPress upload directories and disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://medvor.ru/uplcv?utm_term=value+of+sin+cos+tan+from+0+to+180 PDF link annotation
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afd7703b01b---zulekaxekipupil.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef7a00e78---gifulokunujazofodarab.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087181e165dd---35040262091.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729fca7d23b---sobafone.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/xozibupowagidisa.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/hueo1c7phs777ecs4qhl9famj1/18891978824.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/40894373099.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/cd7189a27e44bfdb13e2b0c261d68e12/70041271994.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/22649413300.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/2a5400fa57aed1c6b1fcc2c75acfad9c/42487968170.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/38274947616.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/0j9qtcp2nn9v7c8p5ja0oum3l2/lawuvugi.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a24d0614c8a---71014425226.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210610_021CB938543AF7FA.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/94441280338.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/2187301618.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094882c3000a---17989142206.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ed369b0c85af0a9e4ef21fd43080b6cd/gemasitu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/acc7a56a272f8eada028506c22775626/23308370796.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c307fe1d5dd---28472866276.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ad30cc8ed---zubipopetomej.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 16140 bytes
SHA-256: 9fc4adf05be99ba94f6c9714e81f71f84bd824bf50d5ec5f1123f813e28a211d
font_01_sfnt_off00012bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14405 20308 bytes
SHA-256: eb1c7a2f9b3b4d3f4b2a6f600ff6bca025fb48471e018769f47036762b7f9ef6
font_03_sfnt_off00017a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A5D 10948 bytes
SHA-256: 6d10e5d00151ed8b3aebcea596ad5360f787d8a36252031d83c491e60a86d01f

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