Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac99d25b4227590…

MALICIOUS

PDF

78.6 KB Created: 2021-06-12 19:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9356d50e7cec5d6c39de7574ff0140cf SHA-1: d5e98cf301b7e5d1a65e1f6f3d6a0c25c5da85ce SHA-256: 2ac99d25b422759027ec4577f8f8909550508f3083c14b49f719991262fb57e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious, exhibiting characteristics of a phishing lure. It functions as a link farm, directing users to multiple compromised websites, some of which host further PDF files. The presence of external URIs and the ML classifier's high confidence score indicate a deliberate attempt to deceive users, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=new+hollywood+movie+tamil+hd+download
    • https://communeouchamps.fr/userfiles/file/45462473955.pdf
    • http://viviapalermo.com/userfiles/files/lizowupa.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c5dd1d06c---mesodosixabanogawaxudi.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/b200d978105638892439bfae121ebe6f/rasewadidopeferan.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e48c484cc---75535371536.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4de2beb775---70318185784.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2caee19056d70ed2b8fce8e2dea4726b/kosodenufizalu.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ppp8a8gdq9ehd94no4bi6r8jgd/kagof.pdf
    • http://aweibel.com/Photo/file/palevalukipibesipo.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607f18fb412e3---66310297356.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a3acbff79f9763d23e23b517df6aab93/34790844251.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/3aa9hn4noje3nj13q6o2dt2clu/36901821180.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/epop1gadv34a9hn26c6jeuhrem/52803238332.pdf
    • http://www.awakohchang.com/image/upload/File/oluteriv.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-2/20210502011953236708.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f684.bin
16fc4ef1d007f5be3d92d6897522bceb1c2f7312be314fb0e939eb1039bd0190		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 5016 bytes
font_01_sfnt_off0001078e.bin
7bdb89cbba7666243ac9de0d1b6787b9a14074addb8c467745b44641977186fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 11156 bytes

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