Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd64fe479959b2c…

MALICIOUS

PDF

113.0 KB Created: 2021-07-01 09:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 170894035968a8c4e23952126f7446a3 SHA-1: 319adc9732a789656420dd8f07c35a81e0429539 SHA-256: 9dd64fe479959b2c3d5757ba5e1d419dc3545087e2f714bed6f3eb9a8ef4bdc1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9330

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://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/579d26b37819bbf843282743f17a5b6b/bijutorogawapafad.pdf In PDF document text
    • http://www.radanhorse.com/resource/files/33820419649.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/sowusebawer.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c910872a448---87572152131.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8cd1bae28---menekinivo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912d6744c33---jigabomo.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/sijovebazazurefevugali.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/87190406925.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acd3ceda85---85515015433.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/zigexevozosixozagax.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/dopuxagenoxoredur.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/tatuziworutawebojixip.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/aa015da393cc0ae203ccc052231226fd/tubixowepeji.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bccb8621c---dowiluj.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607151b596672---41583456950.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a829f1b4a73---58224661215.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/jse5lakt991rp5cfle0gqbhe95pbu0i5/gunujizuxebiwazakonoke.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/sizidotisude.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160819ac5bd65b---jimanegogexemo.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/e357df1696a699c47aaa17c989fdc50f/suneginepejanepufepiluso.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec9de2bb2---13600620869.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5da5ca8443aef2d02505cb6b6f15174b/morabamexo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb79eb7480---luriboberubegubug.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/b28d6d647b0d8cd55cfd46b42939c72b/fifuromujagifak.pdfIn PDF document text
    • https://andrejc.si/files/file/25058659007.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/4t7sjivd6bnt6q7jaa1c252q12/95644290358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=would+you+rather+questionsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001326c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A83 10696 bytes
SHA-256: 4fd80cf208157f60af6934a8707cba69bb233531f5fd5875c9bac32555e868ba
font_02_sfnt_off000162d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D2 18348 bytes
SHA-256: 3a52237ee2ce95879c1a99cae96309011bcf76b4fe4e7a76fd16a1907172f321
font_03_sfnt_off00017eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EB5 17992 bytes
SHA-256: e6864148e314e703facdd3822af86777fc6f1d2b40c420fa5094eccbc45d1ceb
font_04_sfnt_off0001ad87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD87 1660 bytes
SHA-256: 83d8b69042e51bc20ff8f2b5d6fa789650ded0a96709c4f9a3a2a9fd205348ae

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