Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f09191a8ec61b3…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 23:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ccba4a06425573104b29debfcc5d09c2 SHA-1: 8e406f832e65cb02555acab52d4b5da8a715e9b2 SHA-256: 84f09191a8ec61b37482ac2312f098655eb424a2e829538a3df6748d64f20384
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload storage, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://reniuved.it/file/gasojaxizomixofazifidiva.pdf In PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/bapugepofuvebifek.pdfIn PDF document text
    • http://vina2002.com/uploads/files/masud.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d33b027ac7---19410109173.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/nojogezigolixajapod.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/17573878514.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/tigesobem.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109051636272928.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/9d47f4fe8c2ea89a82ea320d56b8d523/dorawolirona.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446882cd239---13031728460.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109230153417779.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614d49f8e6ec0---fuduzow.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/suniwo.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/59446972537.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/45060614523.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/kupokux.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/43387466284.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/jenumonerusek.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/timipisekuzope.pdfIn PDF document text
    • https://btegypt.com/file/naxini.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/51344495610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=we+need+to+talk+about+kevin+watch+online+123moviesPDF 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_off0000ab68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB68 15444 bytes
SHA-256: 6411404242d96569510be5580679e2a1209d87169ad6dc7daf771019fbdaaca9
font_01_sfnt_off0000d2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CD 11356 bytes
SHA-256: 1c0979104ebc97e3a4264dd5a0639ccfb6b61cd32cd88894b307f46e01f045bf
font_02_sfnt_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1