Malicious PDF — malware analysis report

Static analysis result for SHA-256 785f1610965b3032…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 10:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f77a815e4c93ce93a0a1785aa433b27 SHA-1: 76ee8e438b016c35dc85678117b8212da567c512 SHA-256: 785f1610965b3032c8319e856b724e1405d5fbf9f9c3f1e08dbf51b0ac1331ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1659777517ea9ec72d726ac2c81ba7e6/davaxatefifotazomoko.pdf In PDF document text
    • https://graveyards-fuj.ae/userfiles/files/49691150784.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/44134253505.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/gotegobumetajazowisut.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/fosotip.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/23e19d12da826ff39b09748f1bc1d59c/10130257387.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa49097ee28---5034010827.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/72953027253.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898c1a87132---83516640639.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/tovuwaketifevibeg.pdfIn PDF document text
    • http://groupkaishan.com/d/files/5741750134.pdfIn PDF document text
    • https://migger.dk/userimages/file/soluwibixapebe.pdfIn PDF document text
    • http://flirdining.com/uploads/files/mifidekaliru.pdfIn PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/sewol.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/92773115768.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/92655421751.pdfIn PDF document text
    • http://asvpp.fr/pdf/17282761919.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f636514e0a---86638987747.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e32a9bddcd1---lefol.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210829074905.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/dc6eef3ac9ca29ed7382046550f6f40e/77356894792.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/16799660410.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/3864146298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=residential+lease+agreement+fillable+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_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 10904 bytes
SHA-256: 863b04b96b9b28ca46e358aa3be948c6bce983095059c925b34f8f30bbdc3667
font_01_sfnt_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 18028 bytes
SHA-256: da370ca59e81fee915cee400af0d489cc35cb4e1e75eb72f2ca665f4f3493fb2
font_02_sfnt_off00013261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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