Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1ea057d3a966bc…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 20:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b73cdea21d02daea5a6f44e5075502b5 SHA-1: 3d5187f0d37d7775bd4bc7baa32b7f2befe46969 SHA-256: cf1ea057d3a966bcb61858191fba2463e0c27b6de16b265c6cddfc445f013125
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly point to a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://dm288.rs/slicice/file/19139304643.pdf In PDF document text
    • https://magerp.org/upload/files/ditodapaduxulukub.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/afc038e61d36d00a9f3fdefe98be667b/zadixad.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070b744bd71e---febubitetarutaxesebu.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/6623138130.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/jatarigajiviv.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/55762688998.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/xevupifakapasex.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d8e88d06819c7ed448a99b4f53e13f26/kudevufowagafogumipizater.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/12342884319.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/22032815028.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c542daf753---20252712309.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/jazuju.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/torupikulujifebazubipe.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/lekudapukoxitagezusuti.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/navegagafebawirolijiwa.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-14/20210614115936908385.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce58c540ad3---72236111711.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b559192c714b61040ab4dab71a7a2b23/44025855682.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/98320048361.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/r3lh4dduc0at5jinl336g1ulcq/rarigixelugamogolod.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d7ff43160---70137312842.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/regalerubonum.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7k5vkt82ru954to6mtfi1ggik9/21924722471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=niti+aayog+annual+report+2018-19+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_off0000c37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37A 17016 bytes
SHA-256: 2f33260a6a917876a09a238939d164747b1d253f4e743a292abc6db6e3bfc719
font_01_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 11400 bytes
SHA-256: ab2c586b86fef954e7c168d737e70d07eac51a3b8ea00586fc4b6ed097df0ed5
font_02_sfnt_off00010b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1