Malicious PDF — malware analysis report

Static analysis result for SHA-256 f287db0d97c81d2f…

MALICIOUS

PDF

89.5 KB Created: 2021-09-03 03:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12f108cd1264fa3e416a945145b87348 SHA-1: 3162d93235157cae959dbf5a116b8ecd58176340 SHA-256: f287db0d97c81d2fbd96a8d7f89f8e4803cd469023fb6b145c4dc8b6aa2f42fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=greffe+en+%C3%A9cusson+pdf PDF link annotation
    • http://mybed.tw/uploads//files/202108060338558286.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/sipabizerumu.pdfIn PDF document text
    • http://01host.ru/userfiles/files/vitizoxugupesawono.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1623829410.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/lmp1l7m2bt427j9kuiujhhc9vf/nonotawubisubufozezari.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/40205933641.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/97918586203.pdfIn PDF document text
    • https://led7.ru/file/gadugazasom.pdfIn PDF document text
    • https://ei-hotel.com/free_images/files/73171260028.pdfIn PDF document text
    • https://belloverde.net/emailer/file/badowifebudosefox.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088c3e58c832---84361778355.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/zojurovegesulabi.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/lejatax.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/80140802877.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69384386080.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb4ba7ce9---25315520866.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/vokis.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/razulafemobikarotik.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/itjnf2it9f8mud82b8gufgtc35/19789558421.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/tejerowi.pdfIn PDF document text
    • https://ubranni.com/uploader/files/riwerupep.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/2g5fib68d5sb8cp89tpo1akv6p/43635694701.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c9bff576ab9c0a3a2ed6ac17bc042bd3/zepirujinugikif.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/62182047003.pdfIn PDF document text
    • 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_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 21652 bytes
SHA-256: cf848d0744ba72cd935cbc890cdb52a4bb2f58c1440ce68717f43ad80ae0efbd
font_01_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 10508 bytes
SHA-256: 7f2148b1fd6f318550a4ed7950a235e0d7a79ae34473f353868856840b84d49a
font_02_sfnt_off00013eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.