Malicious PDF — malware analysis report

Static analysis result for SHA-256 03926be9af1bb9f2…

MALICIOUS

PDF

95.9 KB Created: 2021-07-05 01:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54acd46a9dbef03e587c9efde4c0278c SHA-1: 63b7e88b76c83c96310d95c2f8945c6a06e4a7a9 SHA-256: 03926be9af1bb9f28b8830fcc5caf171e7276a1f0d2d515c5b10b058770d894c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised or disposable hosting, indicative of a link farm designed to redirect users. The presence of these link farms suggests an attempt to obscure the final malicious destination, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d315c62077c95acafabaf76ad6486a32/9137822128.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e86f8d0ca---vokif.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9f33223d643065ff494b46f39af36721/29004599549.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bab3d7196d2---17154741482.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/2269b5697e5f4087e341800b2d180fd8/lugixibivogeriperujek.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/52adaaebf9dad3f79549d603edc55db1/gopagimugazudenowe.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f23d5bf908ea01f969b9c7ea4ccaa923/95154525052.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/69610624363.pdf
    • http://huile-de-nigelle.info/userfiles/file/8974932365.pdf
    • http://asja-doll.ru/userfiles/file/33467960179.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9c2a4148---36814595840.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f66139581b---bovakelizoxewivaliniwo.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1551bc4748386d5935431614628b7cb4/33322975422.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ea3e4de5fd1ea5f9f565a118a3585b3a/49556392439.pdf
    • https://bleikss.com/userfiles/file/17787545753.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/db54823dd245750d847e932de6c2571b/92608896838.pdf
    • http://accessiblevehicleservices.com/userfiles/file/basitoxe.pdf
    • http://sparan-art.ru/ckfinder/userfiles/files/bizupuga.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160730268091ff---89443881491.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/51sbpkae0vnaghde3q2r31t1sg/tanovukufisasuzutome.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748e6f350c8---zozowufodez.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/02be3d1fd5c055ec3ab252be1c1eab48/11597645193.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=golang+unmarshal+example
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/65069a0ae12bc9f8f668f0c69d831290/36102238930.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd71.bin
9f9c9255c0426c77c5b13ef22f4242f4f7095bfd8ba808a20cf1712cd58ffb40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 16236 bytes
font_01_sfnt_off00011307.bin
32f3a9e453e058036baf8905509e7c2a8cbed5a720836e481eb560ea08344d2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11307 17564 bytes
font_02_sfnt_off00014184.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14184 16792 bytes
font_03_sfnt_off0001599b.bin
308765c02a32bf72f8d68a803da57de2da061beca47f2130de3eaadba803f86a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1599B 10752 bytes

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