Malicious PDF — malware analysis report

Static analysis result for SHA-256 228aadfecf71e15c…

MALICIOUS

PDF

84.3 KB Created: 2021-06-27 04:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 963e58871bdbff0d0b0c93064256546a SHA-1: 81998a6ab5b93e322788515017619f80d2a7f2d7 SHA-256: 228aadfecf71e15c988d5017d40a6927f009234879338cd40e4f7385d62260d9
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. Numerous heuristics indicate the PDF is a link farm, with many external URIs pointing to compromised WordPress upload directories. These links are likely intended to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://huntic.ru/uplcv?utm_term=what+will+attract+rats
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d71b7db6baadd7ab72a8ea58f95eb6a8/50920633188.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/c170f9688b18d41d0fe699dc42ad2156/79509444010.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/24770893697.pdf
    • https://condominiobrisasdelnorte.com/userfiles/file/zupifabub.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad9a495b1---76651136947.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/ugpbdqo75e3e8h89j4dp9vimdv/84364659630.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/64rm3s15gjilpfp7h4b91rdprt/pegexojapivelumifijiz.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/03jn6chbvbiobs3uem4n7fi0t7/posasogavifasuruwuv.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/h8iv6bdemmc0u4sv4h0ptrlso8/torod.pdf
    • http://imailbox.nl/images/uploadedimages/file/gaverorozawepilepif.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/ed7157d913b3d76ed1a82408009db54c/24923086257.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/badasefopibewekivude.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6e20fec55af5a2c15fbd7156b4fc8dab/peperosoto.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/qtq4rsijoi2jh2kcs3hpcg0an5/83705923460.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef0e255a4c---xugowaxekaronufekede.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17563205f---dadosex.pdf
    • http://crocepadrekolbe.it/userfiles/files/tifufosojosojar.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607a904946c78---69372581942.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/92ca41e564087976ad7330d13dc08358/72842106524.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c19fcb050b3---rusubokawezo.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/19ccoc0tg1o94hg23e6bc478pt/nutukumofer.pdf
    • 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_off0000e8eb.bin
afd1c0fdf456f0af06b3a8ce81e4920bede12dcbd9db9f9e25a6e763568d8f4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EB 17176 bytes
font_01_sfnt_off000115ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 16792 bytes
font_02_sfnt_off00012de5.bin
cb7815bc20fef29a43706011641c49004aacace992bdf9ec04d887aaa97fba40
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE5 10052 bytes