Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da964a0e6a076c6…

MALICIOUS

PDF

89.6 KB Created: 2021-08-10 07:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 889db1d574e0651292c6aa9569c9060d SHA-1: 3fb39628f264c7e375afd307d2063cd047891ebc SHA-256: 3da964a0e6a076c6b3d121d7fa5b22fc3f04c84f9cd03ca3368f098af898ebe6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be directing users to potentially malicious websites, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=xposed+framework+android+4.4+2 PDF link annotation
    • http://playeasypiano.com/resources/fck_images/biziropizewobelidusib.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e15c041cd3---43753686366.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8c4900881---jowusewa.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a32ce225b---23946156989.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/6371728991.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6b19b774d8ebfcd11b136479af5ca3a8/zusen.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/7843627759.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/a6c5d529031b9cd3cffece2097c2243b/1989494933.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/dalozizasomolutironuba.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/27599827251.pdfIn PDF document text
    • http://armanetti.com/images/58669034794.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/zukadedupimisotuku.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/dawofo.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/662991b8c6d5e08b5303ae2cfee4ffea/bagunivoman.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/jowipojixawikati.pdfIn PDF document text
    • http://prograsifkalip.com/files/warozo.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210726_47B47263332E4AA3.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16077d544cc30f---49933495559.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/35587d9c99e0ace9076c518ff6ff5fe2/puvorodajexuzesatebuxusi.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/2vdk6rk0iq24r0q273f550hgm6/35608666851.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/50975872547.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/vajokofanamagamaxotirufob.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/pasoxulakufugirosido.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210703043320_537171.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 17544 bytes
SHA-256: f97ff4236e0b6ce547145b22dc617954ede38f8cc5eaadf46df558f6bb857451
font_01_sfnt_off000127b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B8 10964 bytes
SHA-256: 116c0ba1f2996d0e45ce2943e9d0a2c09ce6969ba9f1170f32ce82526077dfe0
font_02_sfnt_off00014141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1