Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc429df86f8a12c…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 06:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7389e31410cf7de7c8611ccc9c04d0b8 SHA-1: 973a9fd6b8782b79a350e3228adc6a59117ea3e6 SHA-256: 9bc429df86f8a12c7bdd665370fe8dc979205ad070a724c2de05035e5d63c64d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and link farms, indicative of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to lure users to malicious content, likely as a spearphishing attachment.

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://infrive.ru/uplcv?utm_term=naming+covalent+%28molecular%29+compounds+worksheet+answers PDF link annotation
    • https://floraplant.gr/FCKeditor/userimages/file/risalesimijafizu.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/toxip.pdfIn PDF document text
    • http://consade.com/userfiles/file/60122737509.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210522010714.pdfIn PDF document text
    • http://nccutrackandfieldnation.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/11668461776.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/87630579893.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/1511761220740330e7a26520a685012f/19954535751.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3b9bd525e6cb2dbe309ce8f67e18d627/23752833002.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/74247323838.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/4bcb013776823886763d41d83d93c53a/tonodexe.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b05f161836f---totusibira.pdfIn PDF document text
    • http://cloverdiamond.com/file/34825143606.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160aeef2f5931e---36540006359.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2c7df163512990e6171818032ffa31e/deforonamemiposewepes.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/qhf256351bgkh8blpsc4juh985/bojonuxaw.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/doporenagetufixejixuxef.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/wafumubebovodomuwij.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/9ab2fa1289594bb75509e68669935d7a/959827398.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbfdbd6830---36118258069.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/20738207934.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/renebitit.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28358ae4a---nesoxiwarifefadosudutog.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/kabarituroz.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/95360702961.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_off0000c22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22A 11440 bytes
SHA-256: 5c7af03c665fee2e1ba0106dc78852c7910612f953df99575399d9617a2eb85c
font_01_sfnt_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 17224 bytes
SHA-256: 642cdef76e5f2b7a3fd65a382a085e38c0b4ec636f6c9fb2e583451f1d655384

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