Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd215b5478b4f61…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 02:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 608cc638aa693913e811cffc17e12670 SHA-1: ff0902df49f203c242f801602f2420191fd36ab2 SHA-256: 1cd215b5478b4f61c24bd08653118c08da38fc4c409eee780c13875ce11f90f3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be directing users to malicious content via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://krisoc.ru/uplcv?utm_term=destroy+all+humans+ps3+download PDF link annotation
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e9e9aa0b---zifufuliwofev.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210527195253.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/bagtrk3iflssoj306io4ema53d/50279729530.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/vikelemusidiwiwotux.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/61014186583.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b1e2f4e3910dabd49c495863a7bcb284/jadodewof.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/parazawasagabapoweseguzid.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/25743367409.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/9f8ed9afef69a96bb8ab4a450bf14b21/65642037571.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/6382880797.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/dawelufiminukimid.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/54815718235.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/bijafiluw.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/qje2g943v9siqtq5p0luf5nou9/65529180575.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607603a011138---ritaketotoliwebunuwodab.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084be4035390---dafabamolaponanuxejabab.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/vu4ut3ht4vmevgsre43co06pea/48355383808.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c7bbfbc0---niwafenovobitededere.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/buduxibomukoduvogubowovub.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fd216bb03e1---busevezadutezafumolovipu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085a4822722f---lifasatokugigilabiwe.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/2683324385.pdfIn PDF document text
    • 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_off0000c42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42D 17336 bytes
SHA-256: a3bdf0df0684c9246035f6bee41e7f87eff00430623318a25c2d66774c2ea096
font_01_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001099d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 11036 bytes
SHA-256: 835def652762218d73ddebd1ebd11d2bfaad3cf901e38c930c0a8b84213c0371

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