Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4d5a0e6d1e8755…

MALICIOUS

PDF

76.5 KB Created: 2021-09-03 01:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 391290f59e2833aa413515635dbc5489 SHA-1: def59ec0ac260a609043358d1148b343da3e9eb1 SHA-256: ef4d5a0e6d1e8755f785ee908b25379e648126b39c8a8ef2a2cbb981eff62015
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5k10r5tgmsviu5nr2n1u8e4l43/xatod.pdf In PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2263d065e---jegadusomorefizi.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/34125806957.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/572be62fcea3093419126fee3b949d15/tibofatutuvepuf.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d33686ba984---47883569667.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/uiqo3ju8qdrur19er5hnjhg1mp/91840753488.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/jemagelibonudununonav.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/84320739262.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/futabofogapolozasexi.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/kemuronaxufexiluzijum.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/f99004890da4b3fbd3a081813189f1d0/66295330346.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/lupisametapenezati.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/1853481141.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee6c1e30b---sejiravuwepulex.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fcaba3ab6b244b1438b754c2a81c482d/gozut.pdfIn PDF document text
    • http://edallyshop.com/upload/files/39878126014.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/6936580151.pdfIn PDF document text
    • https://menu2uplus.com/images/file/tageke.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607592aeefb9d---femiterabibixukogi.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/36474097329.pdfIn PDF document text
    • http://aqcons.vn/upload/files/puzironif.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/kipagorizabavuxaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=8th+grade+math+exponents+worksheets+with+answersPDF link annotation
    • 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_off0000c72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72D 11184 bytes
SHA-256: 3e17eae3fee09026e5a38f0ec45ca61a99a4ca47406a4ba58dc8b25cee24f5d0
font_01_sfnt_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 16272 bytes
SHA-256: 29a90afecdddaf374e6d0ab52fa54c0403e1b0f51170b4d8cf069be32c327509
font_02_sfnt_off00010a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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