Malicious PDF — malware analysis report

Static analysis result for SHA-256 a687b2af9595a31e…

MALICIOUS

PDF

192.3 KB Created: 2021-07-25 12:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da362f9b98bc92555f307075fe160461 SHA-1: 6bdf72e4a2507594f4dac9aaa0d4dedd4beb570e SHA-256: a687b2af9595a31e7fefb4de832a0dacbbf14f176416c19e4571e57423d75172
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/45271244ba49796b074342362c077a0e/jipesipegaxidek.pdf In PDF document text
    • https://tanthuantelecom.com/upload/fck/file/varugisodobirudi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088392ca3733---87891420480.pdfIn PDF document text
    • http://mosjob.ru/images/file/gukad.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608782aaa99e6---zapevamopaji.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc328f077fe---mupofenokogoboze.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/57999935898.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/d5da1db21afdc6f18f8079ca00b48217/jolanetiwewaki.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/8713939816.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/53942196130.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b62bbdf806a716b20096d371dd415e1b/98643227562.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087b67a14127---60367782123.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec15f26517---6572558737.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/f2f0ftulov2f724d464m8j9ie0/2809697586.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c853b16272---24429785945.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/jezujomunej.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/zojewaje.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/heh8ihfg16p5okrninvq6btok4/sexelaw.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/31636600053.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093dc33a0db5---samolizemenebezaziwezafaw.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/b7b2f8a09c37c67b121ee347b7818cbb/59791253972.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/sivejonafusi.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-13/20210513202659128797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=holt+mcdougal+biology+study+guide+a+answer+key+chapter+3PDF 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_off00028fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28FCF 11656 bytes
SHA-256: f32e7c215490c2ecd477dd2e7d875ff3393bf39d39bbbd7c6336a609fa2867d1
font_01_sfnt_off0002aafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AAFE 17860 bytes
SHA-256: 6a0ab1dab42d5e48405166b0325b48743b5d3734b17eca91de1cf1bd36bf3939
font_02_sfnt_off0002da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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