Malicious PDF — malware analysis report

Static analysis result for SHA-256 e969b9ca02010ce7…

MALICIOUS

PDF

72.7 KB Created: 2021-09-05 03:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0db3756960fbf78259055f019b707362 SHA-1: 50df037c5ed58eb9c6f0a08fb0ae78b81ec132a4 SHA-256: e969b9ca02010ce771edb42c65b7ba86fa880b787539b758e71feaaa1effba65
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to manipulate search engine results or direct users to malicious sites. The presence of multiple external URIs and link farm indicators strongly supports a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://duproject.com/uploadEditor/files/68221122171.pdf In PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/52594710218.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/xedosoxumag.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/mukenutako.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb85da9e6d6---79865440275.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613169a87a339---88413982910.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/44934193512.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d07d40534---defejoranisolipogufoloj.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/judoduve.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/koxujinazupum.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/zazanelilobekugipibe.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/28220894733.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe084b76c---68727388706.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/96t91oab71php506fb6sio09a3/timelofada.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/9241954054.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/lekevukofokugesiburi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16121d0ea7e8f4---27617094251.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/96930523123.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/53813589221.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/78b8586339008c5893bf76315a68c043/80470753400.pdfIn PDF document text
    • http://builderall.info/userfiles/file/tixeruridupujagewukufozup.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ada107886a4---tikuwobafoxo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610b6f2ab8ab0---jusutusixuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pre+nursery+colouring+worksheetsPDF 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_off0000b8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BC 17004 bytes
SHA-256: 44fea6beeb485d8b07f6780d8045894fd13c59fb72869340755de088ffb7c607
font_02_sfnt_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 10740 bytes
SHA-256: 016d6bf9b4336572851cbfbd8cddaba565912970bc0b5f68d0f2d471bd42c8ac

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