Malicious PDF — malware analysis report

Static analysis result for SHA-256 7368c982a5899028…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 20:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30b95b2d32b72be4500c0fd88fe16622 SHA-1: fc1b9a0492fd69d7cbeebf89b20e895577e88c8e SHA-256: 7368c982a58990281b6dce241e15d4daf786f3edc9137779cad086cd6874c643
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://drafthe.ru/uplcv?utm_term=the+witcher+3+the+whispering+hillock
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908f6d3bac5---78247455928.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/g1bop4vvuo1d2ocipukd5dta2b/90129977846.pdf
    • https://nhachoxebus.com/upload/fck/file/6571029679.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609075a776bf5---dobamutopagu.pdf
    • http://syuncyoku.jp/upload/file/xesaneruvorigase.pdf
    • http://gesundezellen.de/neu/userfiles/file/41913821302.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/b3e0ijg4tcu5gh13uokv8tr8er/43287516014.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6147b3ef80---tumok.pdf
    • https://creativitagh.com/pevron/www/img/file/kujaluzagolu.pdf
    • https://alteanetworks.fr/img/file/18314812560.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/kefizuriluj.pdf
    • http://samuiluxurytravel.com/Uploads/file/soduregepo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c82fa1249---lulegax.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607851c18d4d1---jewijevodujalijekiketebi.pdf
    • https://gbagencement.fr/uploads/file/44659280195.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/162365851730.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ohvrercuq1jn7rtf4ms4ncte0s/49733399299.pdf
    • https://noihoithanhtuan.com/media/ftp/file/berazalutapeten.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d5868af97824d0b0a1682199376b5b04/visudalodijiwevadobinojun.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-12/20210512030158198508.pdf
    • http://bukhatirhomes.com/userfiles/file/vobabanamojibitiwopo.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e304e328---gelige.pdf
    • http://highendschmiede.de/highendfiles/file/kuzavelexurupakaxar.pdf
    • 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_off0000ec9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 16792 bytes
font_01_sfnt_off000104ac.bin
04540bb4699b51d68f1fa436d8a34c88be87395e8a2ac838d9d9030a9ab0874a
pdf-font-stream PDF embedded font (sfnt) at offset 0x104AC 17244 bytes
font_02_sfnt_off00013161.bin
3579f192924afbe285955225c96ab398fdce142ce81b0941f0862032342e8e26
pdf-font-stream PDF embedded font (sfnt) at offset 0x13161 10804 bytes