Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc35476d8a95379…

MALICIOUS

PDF

76.0 KB Created: 2021-09-21 00:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 695181bedd8cc7f11bf328d234e68a2b SHA-1: da64f121bb222336bf7e017acac665056430b86d SHA-256: cbc35476d8a953793871157f51e987b4e0a9d5c961c2143696b538f5b571a45e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://rhondachem.com/d/files/naxisenejotepigedofa.pdf In PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/fegomuvubawobujujefiputab.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/68244705850.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/novigopoxotalufimokifime.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/0d1c528f2ade53b46028dd4552eca61b/50370354109.pdfIn PDF document text
    • http://bdsductri.com/upload/files/65715748029.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2de2bb8f5---dalabazovunugosupamuti.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/13523219677.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/51558615012.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/nawupininezam.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/xejilamujiruvajawaret.pdfIn PDF document text
    • http://hkacca.com/userfiles/modinarexozob.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3dc61e10e---jorepodivetota.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/xajulimexaxoxibu.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/kotabowake.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/59dfaec1f8e5599dcee3c25c7dd27108/98906799840.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478293b6fa8---59914661284.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/dakubifimezudedizabe.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/68727529380.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/8082686768.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/83947708237.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nazepawimolutemowi.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/97024354407.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614486d5d63bb---96937417892.pdfIn PDF document text
    • https://mihalex.by/files/files/73806777493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=wma+player+android+freePDF 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_off0000c204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 10500 bytes
SHA-256: 324b1fd2a79b268c9e4686c0bd3dabd10ce382b9fc42e9d76e00093028f852ee
font_02_sfnt_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 18600 bytes
SHA-256: d8317ee8c9ea9a62645bb077bdfe5bfa178a7d04f0a2414b0243b480f47c5a3e

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