Malicious PDF — malware analysis report

Static analysis result for SHA-256 216daa7536d3c4c6…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 17:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5baf3d8cbe92abc2f0b263e36d4547f0 SHA-1: c63a2f86decb7fd25b645c5fd50bced71d0a6b59 SHA-256: 216daa7536d3c4c664f4bb0c7d647b106c14caa377c829962cd5ccf87e9f1eb9
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 compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the overall structure and URL analysis point to a common tactic of using documents as a gateway to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://ketchas.ru/uplcv?utm_term=thanksgiving+word+scramble+worksheet+with+answers PDF link annotation
    • http://ciaooo.ru/uploades/userfiles/file/53735590314.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/notosixetipavexevixefozo.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bac07886cb---mekowijufisakiwatuzezow.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/95731712861.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/komexotuj.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/96731665917.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210818000854.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16110919199b6e---talewemebis.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608501f4a1940---42743154726.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/kubedoxo.pdfIn PDF document text
    • http://artospace.com/pics/file/84884808512.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/17277539919.pdfIn PDF document text
    • https://ms01bet.net/contents//files/latozarexujav.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/90161683131.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/mekarulo.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3bb66f855---murokafuvezupudem.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/45797185923.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/20970816227.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/zifobegijofu.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/d1d37ad8556fc9973ff52039f6862fdd/fokug.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/dovinifotokabewer.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161329e4ca0f26---fawumew.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_off0000dd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 18032 bytes
SHA-256: ba7e510da0761e10bbd256e5fde8474a5243d904beea87aa3ed7d4455788701c
font_01_sfnt_off00010c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 11164 bytes
SHA-256: dcc72945914b7d6e3ccf3b5bbe9f0bd702185325384270557ae2e142afa4eda5
font_02_sfnt_off00012618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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