Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b72924cd745df7…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 23:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 643d1e4492f850a14a5f6fa9bd11032d SHA-1: ce457ba24629c8137810a51192129643bfb5ea78 SHA-256: 67b72924cd745df7cec0f370860c1232de3c45e633b86874086eee40cc5b7183
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the presence of external links and the compromised CMS upload links heuristic indicate a malicious intent to leverage these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/4cb86201c462e93ca0a49088c7e71d19/84450117679.pdf In PDF document text
    • http://kuppersbusch-center.ru/uploads/files/85043823676.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe19375e51---24468137903.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160940941af4b4---74702988264.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/judunapefafidotu.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/t7vdveq9u7dr96mlrceg32uljm/78554419727.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/sisewuvoderewakuxonida.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/vexedesisovagowagepoma.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d51e289251---40510611080.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/pokujufosudegupasolotetel.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd21b798f4---sowaputasugesux.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/sv5p6agve093ri9pgm2pog9hs4/gemitanidasedazix.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/61803171120.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/27605006595.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/22d41f31fa368f919a7d06839662c73c/86650070575.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/vonowitepowanumo.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/19127322215.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/96663356657.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16083862bb7a9d---24543071833.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/xonixepo.pdfIn PDF document text
    • https://eklyps.net/images/file/70022614962.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/fasejikenozuginefiziz.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-8-13/20210813233149284819.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/vamavuzarekam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=exponents+and+powers+class+7+icse+pdfPDF 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_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 16792 bytes
SHA-256: 28f93d502b091b2f69ea6ff473c7030e91758d5a75855abb5f4497a4a4cd5856
font_02_sfnt_off00011ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC8 10832 bytes
SHA-256: e5828fdd8f4dc3c43aa1277cda1ec6e9eaabedde05722afb0f569c5ec9d76712

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