Malicious PDF — malware analysis report

Static analysis result for SHA-256 2305a23b1d3647e0…

MALICIOUS

PDF

105.6 KB Created: 2021-09-05 12:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bab7051d45136167012cc59d0fc46f5e SHA-1: 48771a3a9c5a5308a409971acc04f4dc9f63b046 SHA-256: 2305a23b1d3647e065549ffb2324341d613514efb08c96cfde42e3d031354023
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/b61caa544ee10be3e8a71e876b6a57be/dowov.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160aeae0a8be31---78401929462.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/3i7f5vhqreldkd1jp4nmfl9fgp/9185110258.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0f47b3fd45e888d648d6bfaa2ca7e483/saditulevoxupiw.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/8bea54e158c30b00afbf94a15d39ed67/witisuvirutuvafodopidu.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/41659881802.pdfIn PDF document text
    • https://fultoys.com/userfiles/5253410181.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/46238504737.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/33680095091.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1cac137b5---21365275870.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf4947d0b---45668663455.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d3ab826be---72571054435.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/reradoxalabisamulo.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/jq39rds0oro8g86i6gqtrkidp5/25253538269.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/49335596332.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/badusesisepegu.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/wimewekimanexagatexi.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/23719962113.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41a2abcff5---52956085628.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/jovufogu.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/36319656343.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/tutifutakebidit.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/44460070120.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210702150940.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/49703735683.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/gv214uq2l0e8h8i0iddfr0k895/xanuxupovudupov.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/21044630616.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/bakirom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=paired+and+unpaired+t+test+pdfPDF 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_off00013406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13406 19788 bytes
SHA-256: bbe3309a64189d983c4bc9665f030fae41d863d45489ba25a0c98d01dd44f2ce
font_01_sfnt_off0001685d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1685D 10428 bytes
SHA-256: ae5e19078498e88622157212fd2981580c4d6c171bc139bb7e09706efeb42752
font_02_sfnt_off00018014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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