Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0dfefda897205f7…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 10:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a73bdc2d8f93ebe723d90a61e218349 SHA-1: 51b84e3b8a7b3a32a1c91d5c780cd6d1a613129e SHA-256: b0dfefda897205f75460f7f20c0e35ed12f9203026b9120fbf327765e88ba0af
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://studiosantese.eu/userfiles/files/novumagumupumujesikudu.pdf In PDF document text
    • http://ubestsports.com/imager/files/20210909180710.pdfIn PDF document text
    • https://capecoralliving.com/media/file/wavolorataxej.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/kinijodokamedodinugugub.pdfIn PDF document text
    • http://186086.com/upload/files/60484743579.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/14202558870.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/70599223356.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/zutigusuwigegamizololaz.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/xowewonosetesepixiragalo.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141b0f407dcc---67471780573.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/vipowodefan.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/23074272301.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/kadipanexejemabob.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6c1bccf622b4890442ebdb734ed56562/rakaxabenagolagemebe.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/90203807232.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/44572258894.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613131dfcd9d2---29514150852.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/18199248414.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/68992025706.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/7204532639.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/25300267217.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/23731124093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=strategic+marketing+process+pdfPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/lirajobusiwub.pdfIn PDF document text
    • 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_off0000c729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 16760 bytes
SHA-256: c036216d5e63da86f9ef5d6661bb56c3c40b9c7a12d2a9f833d6db79b4667e84
font_02_sfnt_off00010a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9D 11084 bytes
SHA-256: 4147fb28fa9c01fbb303875c0bcc641692f72c28ac4e5415e1a67c7a82c9c8fe

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