Malicious PDF — malware analysis report

Static analysis result for SHA-256 7769f030a9d0166c…

MALICIOUS

PDF

88.2 KB Created: 2021-07-22 21:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5ad88dc466ea8d8b368af149fa4aedb SHA-1: 185d61cb1f5224889d09e6b2f2be9c6f6c9030f3 SHA-256: 7769f030a9d0166ce882fb33f5c02fa0e98e2380d27a485e91997f983c825be5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised websites. Some of these URLs are hosted on CMS upload storage, suggesting an attempt to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bistakalikotenetwork.com/userfiles/file/7158436344.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d9311fc6---davabixexesoramidowiravo.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c52244cb10---63810460820.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e43dc861b17136070dd93b5b5bd1e6f0/gefuxojavaramedap.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ef1c2688f---61852319179.pdf
    • http://npas.ru/pic/file/banisitugugimuvugezowot.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/jp93v6duv4086v5f38frqr398h/moxuko.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/98f6dab660d4c394639689c1393fbe15/xegijepozubidulukuda.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4f2aaba14---lupewoz.pdf
    • http://clairvoyantinfotech.com/demo/images/suzosadogisovenaw.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/27235601941.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/mo3r48pthefq8008ub4gplacp4/87850940859.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/esgp8bhvaft8gp4m4ejlknor5u/61322538867.pdf
    • https://esvigo.com/upload/files/fopomuvimakaveti.pdf
    • https://hocngoaingu123.com/upload/files/xenaxinikeresukuzo.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16089730f070ba---82555163265.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5e28c6b09---sulexilerapeze.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/cf7dceec9e4b3f2f14981601f426137a/dosiwitubojege.pdf
    • https://congchungnguyenlieu.com/uploads/files/48737119502.pdf
    • https://gloriouz.in/ckfinder/userfiles/files/xebejopaz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hans+zimmer+inception+time+piano+sheet+music
    • 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_off0000f3f0.bin
2d1f41ea1d3d4b72df4789cde716f29eb62dc85b0cd5763a695c6fc76897bb8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 10744 bytes
font_01_sfnt_off00010c6a.bin
8a83eeb5cff49b9ddd4aca58e9fb471d303acf63b80074ac37431ebc361e32b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 17460 bytes
font_02_sfnt_off000139ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139EF 16792 bytes