Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4feab9987e65b9a…

MALICIOUS

PDF

87.5 KB Created: 2021-09-24 05:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d434251de6bf55b23385443e5144802 SHA-1: 5336687fb682d4da67ad45b71a5b07b6f591505f SHA-256: c4feab9987e65b9a47c4d7f65d7fb29d304992ef1c49c573a984cc56696529d6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for distributing malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially compromised or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://borik.customreal.sk/data/files/3712691629.pdf
    • http://khunghinhdepphuctin.com/media/ftp/file/pejegopinol.pdf
    • http://taiwan-tsai.com/upload/files/gazijinekoxiropuj.pdf
    • http://cameradungphat.com/uploads/files/buwatu.pdf
    • https://armagedonspedycja.pl/files/file/robobebu.pdf
    • http://neodermclinic.com/file_media/file_image/file/xixesubofazixijuxojemi.pdf
    • https://tedvandergulik.nl/userimages/file/40870944797.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145053fb9349---motokisupab.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/63d88a414469ac5efa331275481a3c30/vigatumozetulej.pdf
    • https://thefertilizerproductionline.com/d/files/23027235184.pdf
    • http://gibkrakow.pl/uploads/files/60528334378.pdf
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/tumituvivowowikeruj.pdf
    • http://wskinbody.com/data/boardData/files/23828476695.pdf
    • http://0965818789.com/CKEdit/upload/files/ferajijadibixoxusukilapa.pdf
    • http://15441707.com/data/board/file/20210905223412.pdf
    • http://www.radanhorse.com/resource/files/vufebisiwaxukogula.pdf
    • http://sure2trips.com/bot/ckfinder/uf/files/kimavuzuxugobowumuvizi.pdf
    • http://bestpokeya.com/uploads/files/82907799979.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/52915ee5f1ad5468c00c5dce97f4c64d/50215109348.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/nalemulezurojedetad.pdf
    • https://h1t-urlaurora1-turbo.com/contents/files/78898811824.pdf
    • https://bokaichenyu.com/upload/files/92586496792.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/fa15cc54a2ede9ed07acc1626e293eba/salujagijiposaf.pdf
    • http://geodez.com/pliki/file/zanadalodujemi.pdf
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/xusewodujizufijikideveno.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/burozojipupatagi.pdf
    • https://highlander-inn.com/assets/userfiles/files/76755796034.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=five+go+off+in+a+caravan+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_off0000ee3a.bin
f83cb7a9ca7ab43abd3f063b7488d517b9573017b88b4cab57b8d12f956b08f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 19252 bytes
font_01_sfnt_off00012066.bin
88a9f1d3b1ba7e293969e10ad93e453b7a0ed4d219ffc295a0576911ffe0790d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12066 10524 bytes
font_02_sfnt_off00013840.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13840 16792 bytes