Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01c70089ac94277…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 04:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 980fe01786b89070d1fe68a1cbe3f214 SHA-1: eba218b03beee2aa6c12c3af0090bf03cf773def SHA-256: f01c70089ac94277866ce0671d80b20d500a85b7d4eccd71220d3d52cd38bef9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. This suggests the document is part of a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ef487b2038---31661020085.pdf In PDF document text
    • https://t2sc.me/userfiles/93085493705.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/giwegibewotedujop.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/kogedaxinu.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/joferarinodalo.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/maletimotejod.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff356ccb937---20098371087.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/70899934866.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/5671b626ca517f77421b9b6088d289f8/19804744687.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/78509c50ab7e9274abc6f5766554a9ff/dezaxewazivafezu.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66e5a1ec73---77950862053.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161152b2a39a2b---28379794771.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/lamonef.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/ponajazar.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/f67f77f610688eb6d5702fb7e4587617/zuxezenoz.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33b953f17---watanabosuzujimuson.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ade17ae0554---kubajobapevupixilodin.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/55470406140.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7793e042b8---87869169828.pdfIn PDF document text
    • http://buckleyfamilyofdarling.net/clients/0/01/017bf228c8331327bdfb67b1798bff80/File/forufukokabelutew.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/34426425295.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/59842975629.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/46484887480.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a94c78e1dc---sefebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ptcb+study+guide+pdf+2017PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 10960 bytes
SHA-256: 21a859a3285d3bfc5500c565c7b3c2f70fdc9a759104640c13fe8155e7ff41b9
font_01_sfnt_off0000fd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD06 17576 bytes
SHA-256: 30e70b0841cefeb29df26b48c29a716e5b96c0ccff31499a4566a89857a16476
font_02_sfnt_off00012a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1