Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc04e2a6db27749…

MALICIOUS

PDF

80.3 KB Created: 2021-09-10 03:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d72ec4b77a4901c711acbe84530f7d6 SHA-1: 44ea39b62e76806169547efb9c87b1c83d353b25 SHA-256: 5bc04e2a6db27749657629df7ab23ea46647121fd9ece476bf3a89d3403b368f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=mac+app+store+not+downloading PDF link annotation
    • http://hoinhikhoavn.com/img/files/xafavemikezuvujokuzudo.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/kabagizojefedag.pdfIn PDF document text
    • http://unsersohn.ch/images/file/bedepudup.pdfIn PDF document text
    • http://trubaopt.ru/content/file/95490631348.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/24626651994.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/jifisozuko.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/feworimeme.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/33818416944.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/dafiwuzubiwepi.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/18633424108.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/fetami.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/558154018.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/sikadalifaxudal.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161369ba44c622---kizexubeloxuduwuzosu.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/24938246144.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/biwuf.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/pulefenorosobirojo.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/bdb1848fe61a73757ffa232a9de661e5/xadutavuxin.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/9507249737.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/naralexe.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/013c3944b4e6016631dc134a3d265a9d/8224972065.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec11a73d1---77323093456.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/muribelobiju.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_off0000d608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 17548 bytes
SHA-256: 2366a8eee08204eba4e55c94c64469680f92ffcef772efddfd480844524ee781
font_01_sfnt_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B09 10768 bytes
SHA-256: f131f2190a5457ffd77ebb44e2de4464df23d400cabcf04d3801ad56b2b59385

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