Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83697b4bacd0262…

MALICIOUS

PDF

88.5 KB Created: 2021-06-30 09:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f26bbb75465a6a54e8576ccf3e42b7a0 SHA-1: ec2384d5c360e422fcd698913bbbf8982a244776 SHA-256: b83697b4bacd02627381d36f623d512ca18e5ae5c87fa8a9c472053dfe92d241
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to manipulate search engine results or direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://cbgnfinance.com/userfiles/file/14285239604.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/fc213fdd66d9ebf94f3e4428162e2c81/paxetijagagobiwadixusa.pdf
    • https://feng-shuiworld.com/userfiles/file/84790336958.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f93bf551a4---2619895943.pdf
    • https://rajaunited.com/contents//files/4080084420.pdf
    • https://kudamatsu.org/userfiles/file/49125963219.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d61cf780a0594360b40cfcedc45988cf/buziwuxajim.pdf
    • http://sklepjola.pl/userfiles/file/23094512389.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/55963460292.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f1e5403b675538cf681b5992f4bfa136/69560123113.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3303416b---39815456766.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5f5b1428834441a8197b7d640534cd6c/50029632956.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083961feb6d1---43216243587.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/39f9beb4a633cbb88be5aa7def0223dd/kesokigelefisozep.pdf
    • https://pjkconstruction.ca/images/file/nozesutuwurikasal.pdf
    • https://nhaccugiare24h.com/uploads/userfiles/file/rafunajurifutujofiwif.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f3e4adde5---xarej.pdf
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/17365649347.pdf
    • http://www.leposeur.fr/site/upload/ckfinder/files/11751708125.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c1f998d30---lomegafaruzitan.pdf
    • http://king-pro.com/userfiles/files/rofudixosulaxenadosuxe.pdf
    • https://cleaner.pl/userfiles/file/xereniwi.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19fdf706ba---66114404155.pdf
    • https://kingwaterpure.com/ckfinder/userfiles/files/62525098271.pdf
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/19707559186.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607052edd5652---78361929005.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/78d2a3af6fbfb653559348ed10f9b6e8/vuminawopo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gst+class+10+icse+solutions
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 16792 bytes
font_01_sfnt_off00010b00.bin
219347b4d6dc3a57511374727ac81acdf11767bf1ed2977d66bbe3ed6f4ca853
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 10436 bytes
font_02_sfnt_off000122d9.bin
93b4dc50d5c8182aac993d117f51084511eda9150da78b13ef2582e42d783bde
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 18728 bytes