Malicious PDF — malware analysis report

Static analysis result for SHA-256 814d81776c19fcca…

MALICIOUS

PDF

95.2 KB Created: 2021-09-07 22:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d66d84b908eea565fa6a48feaed4c010 SHA-1: 34d75d1dd80e9965fd1b0bc8df74dcedb09020c0 SHA-256: 814d81776c19fccafaeda42b7f627a40dbb119daf03a3b5abc717c89e56e96d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host malicious content or redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users via malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc4ac8a65c---vaborofu.pdf In PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/57898912231.pdfIn PDF document text
    • http://airfa.it/userfiles/file/wazuvumozajodemamaxabi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c12d420e9d3c02a8fa4bd97ca84795f1/lejabagasifoku.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/mapirutulugofunebagubafes.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/bo5ctul2a5o8q8b4llf6kjl7pd/xokoduxudesexo.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/tomarolup.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/rezalanikotunirenifolotep.pdfIn PDF document text
    • https://pcetravel.com/files/file/zemeverizijeguja.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/59765715769.pdfIn PDF document text
    • http://afro-safari.com/upload/files/93171343681.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/7991224ca7487cccea67b3f1935e65f4/20463842315.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/30998699369.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a418fadc2a6---96019993052.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6720aae8780bdb542c2ad3a45e2c5b1d/vufisagomub.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/58gdd25rs9ftjhfk2s22f66ja3/89096720094.pdfIn PDF document text
    • http://inncredel.com/uploads/38742681108.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/50195709224.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/32800877130.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/13619808740.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/zizowebezofugarigezere.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a152d083576---91568183073.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8230264fe6003989df19e22b8b24d309/jekidimosomomowevu.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/biwoxow.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/wenesoz.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ded956759---sabake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=magnetic+boundary+conditions+pdfPDF 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_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 11096 bytes
SHA-256: da5119f4aeea0d14ff5be62a1c5fe51917cb2fb2d68f27858cfba8471c98a1e3
font_01_sfnt_off000123fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FA 19520 bytes
SHA-256: a1f6b1d5b086a71fd8164b67ec092dff09892ca66f98c328990b5dc27896bd49
font_02_sfnt_off00015684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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