Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4f2a2db4227001…

MALICIOUS

PDF

74.5 KB Created: 2021-06-29 14:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b3b91f54086ded5754d7ac6c5ab3aed0 SHA-1: 7af2e8fc55b65dd8ae529ca66ca87fc2a0783d12 SHA-256: 9a4f2a2db4227001383cc949930d8569b0cc3d06b597306e2af19b6a8231a464
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e4cb1fcc---banowudupuxigakepuxoxo.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609485966efd4---3748114832.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a27885bde8---75901388733.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/votego.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/vakilusufuwepenepovorubug.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/48265653096.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/bfb0c1568977df32ee24f1c2239669d7/70901271346.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/dotefu.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/12e226972f8c3598ae718b080a43dca1/segodejolitudexu.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ff5c0cdb45bad67059ef25b5f915e5f5/67421357685.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/70171023236.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/75524160508.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160739420cd319---nejokujivulotupabepapino.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/3117800dbd5ea155701813b4792c4e5b/85839595905.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e070d65d8d---17531097949.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/75653983253.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/gikalivipexujip.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f2b8fffe2282e47455dd32461c93d2b6/27878628010.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/17463383571.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831c65b705f---raroxotadawesuz.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/mapumutidaxizetukod.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/xosaluxivu.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16084449966a2b---2828032151.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/52807373692.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160795a1b6805f---57771972493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+culture+of+education+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_off0000c2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F9 15748 bytes
SHA-256: 82a8cbdb46f9e3c2581b7848e9dd02049fd7ace2a5f57ff63047d47e09cabd86
font_01_sfnt_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 10612 bytes
SHA-256: 9e528f45018aa73e54746288a0383f7b6ce44f845a30a8fdb9f618b148e3935e
font_02_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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