Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae798bffc54c988…

MALICIOUS

PDF

87.1 KB Created: 2021-07-06 17:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33ad26880ecde92401b20dd4a04ba333 SHA-1: 19f5c63e2d817770bbffcc57fd675e89659e186e SHA-256: 8ae798bffc54c9880cd29e74e663c919ec17c089c9b51a7ab5f835e309155501
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, and the ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farms points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8ffe71b0b084eb57604573c4163fca6e/fosenaletusoxakubuletido.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac62de6a87e---mijexarafo.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/bajolomonol.pdf
    • http://imi.vc/upload/files/lovomubenubamajiv.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1d8394d8896e97a84686ae7bf14ba205/rosokagotowofekode.pdf
    • https://solo-enoant.com/content/files/files/96255161158.pdf
    • https://workinhotel.com/upload/fckfile/jeluk.pdf
    • http://ekotronic.eu/files/file/rajativi.pdf
    • https://nhakhoaanphuoc.vn/uploads/files/3409586224.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee21da8016---kupiwalisupuketit.pdf
    • https://anthonygillant.com/userfiles/file/mofuwuvokakoguzu.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e70c3251b2---63446461543.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/cbkh9hmuiif91pjsds1bqe312i/pokopaf.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a9ef83d46---kowivadutaturipexu.pdf
    • http://pcwenhua.com/uploadimg/file/162476381445049897.pdf
    • http://vzwsportenmuziek.com/content_docs/22263427847.pdf
    • http://geriatriccarenewjersey.com/userfiles/files/17072515085.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d4e5dcbce35f859b443bdaca0621ef19/28560827929.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5cdfa71af9075bd57512275303f1ec19/datogopozorigotafup.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b00ef248b1d---visizonifu.pdf
    • http://marinapogon.pl/upload/file/gewibujivafatalove.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608326b13667c---kumaxulobovirudan.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeac56cefe---50718165253.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/ritajupegiriwugofukaxoz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sudoku+challenge+with+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b2.bin
f74cde5a5a09fbc81a59104b41c0ab599313dbe3108f7c67d7eb6eab6a878de6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 11000 bytes
font_01_sfnt_off00010c16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C16 16792 bytes
font_02_sfnt_off00012428.bin
53557ddffed632e62143dafd62963a89db7ba768e4bf5cdf4526e8ff68e2afd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12428 16616 bytes