Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7bab18243b0ed0…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 11:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2ea5008ee7eb9ac51a27da443154a2f SHA-1: d066446cd7e9415eba2d2937fe632bdf1e06ed64 SHA-256: 6a7bab18243b0ed03ba524c21baa5d43aac3a012e7769efd30ed4019d420fc57
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. This suggests the PDF is designed to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://custom-mugs-factory.com/uploadfile/files/sejirokufigenunowazabasu.pdf
    • http://www.rify.us/cms-uploads/files/98097815741.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161333a4c2168c---tovokixosujige.pdf
    • http://ore-processing.ru/d/files/56642300770.pdf
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/48273124424.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/e5b7c966a55a0f301180c756e7c9888f/42948153619.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/foxabugit.pdf
    • https://edex.co/userfiles/files/56510695684.pdf
    • http://leebyenghun.com/new/upload/board/files/zejatonobugamefub.pdf
    • https://geneolock.com/ckfinder/userfiles/files/71247220.pdf
    • https://batikatravels.com/userfiles/file/141009333.pdf
    • http://bergepkolcsonzo.hu/userfiles/file/dufipenolodefatugelub.pdf
    • https://tumujerrusa.com/userfiles/57524243789.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/f0c26bdc27a2d365819c8f589766f0d2/befefep.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name/files/bedavawaxun.pdf
    • https://a-guskov.ru/uploads/files/89211395121.pdf
    • http://hcbarrett.com/user_area/file/supavevodupofifawunuvu.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614179c9ce1e8---8136641269.pdf
    • http://crystaltrade.hu/data/file/zuradurikepebodamu.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140e32e877b7---jutexupamabi.pdf
    • https://meganimal.pt/site/upload/file/kazisafezusufibigoxo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=frim+apk+download
    • 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_off0000d67a.bin
7aa0cdfc32e008f72207f74ec716d7c2574bb7f74419e5d2c72daf67b92030b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD67A 10312 bytes
font_01_sfnt_off0000ed94.bin
d69b13ad47e34d2a6d1fafbd7348fe776878e5557cfa985fbf93f06d3cb4e994
pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 18336 bytes
font_02_sfnt_off00011d58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D58 16792 bytes