Malicious PDF — malware analysis report

Static analysis result for SHA-256 856c1beea8c0f67b…

MALICIOUS

PDF

75.5 KB Created: 2021-09-16 14:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63a68ba94a25b507204e29af18fef306 SHA-1: 3db15c79e7ccf2143d8d5ae964d0bba51504a559 SHA-256: 856c1beea8c0f67b06eca28968ae2a1485033ecb0b1f4ba95ae01c129f2cb04d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features numerous URLs, many of which point to compromised CMS upload directories or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=mini+militia+old+version+game+download PDF link annotation
    • http://polipadel.com/userfiles/file/58546834132.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/rijakonujiwinudu.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/memivezo.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/suseru.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/rebesimavamafamaworemu.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/49590947943.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/97522705341.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/kaparavosunowafagoneve.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/97359484873.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/69440133821.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe90a1ef6---80061863520.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130df6e3616b---fomevaririfejo.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/43220711948.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/43606482103.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/84743459278.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/3405680049.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44583068077.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021091119170177.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/14731447835.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/tosazajuziveluweso.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/patakufejerazidapo.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/111ceaab65cd622aea64c409b7517c41/34170057195.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/kojoxaxivifijinajupevizex.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/64843625813.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_off0000c4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 10736 bytes
SHA-256: 74c087cb758a9ef3a5b8ed361eb89cb08495857bc2936f6f80c51d345286c4bc
font_02_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 16720 bytes
SHA-256: dea330f677b3a93b0a143eb9a8d49285fd5b41da2eb12982531883787e0c520b

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