Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b23d5d59a5e6539…

MALICIOUS

PDF

81.1 KB Created: 2021-08-18 03:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9e9f7ad9f2cb008862abea8af043abf3 SHA-1: 1baa533663cb0ba93a70e57c789b414ad91935fd SHA-256: 0b23d5d59a5e65390fd3cf3bfce7e14eeb26df3c924802ef04a573ef8395be6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f10455de9---71422502112.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/bda30d802c9dead077958a07fdf3a420/428919520.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/9c125d7d75933e23cdaf414e1d6633fe/zetosezaziwidifozud.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c833e144ed---7912523078.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/75209280932.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfa8e96aec---kokupide.pdfIn PDF document text
    • http://www.celso.org/download/fusekejarafode.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/lupaz.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/5766344553.pdfIn PDF document text
    • https://ancoraeducacion.com/images/xurek.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/gawamaj.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/39bd2e463b3ad33c3ac24c518669814a/14946839599.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a8b9e5a1c---93548243359.pdfIn PDF document text
    • http://xinyuemu.net/assets/202107/files/20210730061630324513.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/44086885698.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/tekogebosetalekugewux.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/20ec46ef787fe02329e2c8d82275fce9/28750907649.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1fff414a8c9b59dcbfeb16469166fb9c/wofogona.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/jofapaziz.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/18100126967.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/xagug.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f69f18ab0a---8037695650.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/rulol.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b7028cd8867191b2a73e99f3be90d01c/83039169743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=funciones+exponenciales+ejercicios+resueltos+gr%C3%A1ficasPDF 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_off0000d147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 11144 bytes
SHA-256: f4074c993e220172b7421a5c9cc3ddc5e814deaff652a968b44e39ad70147f7c
font_02_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 18528 bytes
SHA-256: d38fd46cd467a3482568e3b30f814658461b40a42a29b41e5e10f07e1e686e75