Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6cfff32ee4e9d9…

MALICIOUS

PDF

91.4 KB Created: 2021-09-02 15:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ceb9b1390a2210360468de1dcf8de6b3 SHA-1: 798a8e605f35b5cf432d7e61a084dd2e443ec7b8 SHA-256: dd6cfff32ee4e9d9f633e61e63dbd8ec90dea44c3e5e81766043457d7082e282
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics suggest this PDF is likely used as a lure, potentially for phishing or to download further payloads, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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=quadratic+graphs+gcse+questions+pdf PDF link annotation
    • http://vizit-k.net/uploads/editor/files/76381732585.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/ad3c086d87184cadb080c6935ad64b9d/wefotakivalifi.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47e9a7f01c---40918692025.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/kupuxovobakefa.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/vumobuxajefoxusigot.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/2708241493.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/41b14mcl2v16ead9sim8g8utpt/17145049789.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/pugunivafoxujexagaj.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/545549b89e76ea8c6e7a7e65afad62ce/jatafotek.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/14103592677.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/766c8e9d64828c86079672ce5aab6ceb/senenanosabelefaxa.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4ca433420---pefopagosezipavekukato.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ed34a9b7880---sikuwalegojowivevova.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1cb84f477---57889642018.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc9a0efc61---62355637042.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/wapawonuvatefovox.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/80a97d70b62600a5b8f257bb2475ede2/12737407506.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/82943752416.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/fotunaturifatiditaraxizir.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/cfda0beb9e76a7160d186f72baf1a03f/tijaloma.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782b4329a6f---vosobuluzezo.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/nisodesenemanivuvobofipax.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/72395440477.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/8465944286.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_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 17624 bytes
SHA-256: 8a07ac1989f1a9f5e7ad8b01240dc8ed6489a39ee170d9872eaf345b43eb323e
font_01_sfnt_off00012e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0C 11156 bytes
SHA-256: 2a0f1bebe9936a141a504afae24357b6806be6557ae546511261c3868c395add
font_02_sfnt_off000147a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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