Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f55364c9d629e09…

MALICIOUS

PDF

100.3 KB Created: 2021-06-25 16:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c96e251006e652c6bd8ab6005ca2a4ed SHA-1: c617ef644d70eb9126fd31fabe95bb0e4a651d18 SHA-256: 7f55364c9d629e094674d0519fb278a44ea8a58ae311d1f4ddf7a426a9df9cc9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS uploads, suggesting it's designed to lure users to malicious content. The presence of multiple distinct hosts and a link farm pattern indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc30ad290a---82674924001.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa21ac460---sutekujoluwebado.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ohvhdjodlpvvdla08dqdqfruip/4242786671.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/961gtudv90b1deciuksmkenn55/nepidig.pdf
    • http://al-bandak.com/userfiles/file/tidevifom.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/bneklt1gvr8jm8touke2m6l38k/guwogemel.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/51c0a66b47e489a0310dea7af6bc9779/lumasujiku.pdf
    • https://jagamimpi.org/contents//files/takawilezigonipe.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724146ccad5---12530666857.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c08dcd512d6661c90aabc7a14b99dc00/wenuta.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f7b73c8dd903442981c4ea1b97bde0d0/dodekixupuwakawox.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/vg61hmlofa2mcqpiodttl6dv9u/nukatapigemotosip.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077123257ece---65798016200.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5e2fc7d18---13737021379.pdf
    • http://turinhotelcompany.com/userfiles/files/vefefasuv.pdf
    • http://akicgiyim.com/userfiles/file/40490247733.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6903e3247---13327133452.pdf
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d964339582---liniwanerodanumup.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=carboxylic+acid+structural+formula
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010988.bin
205a82feabe0d241a8dff9343c0e3dc9c054a57a6953a707af0c47b1cbaf1515
pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 16832 bytes
font_01_sfnt_off00012169.bin
26d91873cb9c3292940ea58c49c6d0ca455c17e4c69d73cb7d84a8b2cdcd22d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12169 10888 bytes
font_02_sfnt_off00013ab2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB2 16792 bytes
font_03_sfnt_off000152c4.bin
14c0c10db5ae6d8eae744d79073dd852ce695084e11781544f2dbef235b325a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x152C4 18324 bytes