Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db0194188b3fa91…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 03:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 310a8e226c7454f41b7ed44b5ba50a88 SHA-1: b325b7f40d25b51fb05f666e2cf264f087cedbca SHA-256: 8db0194188b3fa913b9ad020939ac743a71f18523b44196da390dd6b9b201359
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest this file is part of a phishing or malware distribution campaign.

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 https://archism.ru/uplcv?utm_term=boiler+feed+water+quality+standards+pdf PDF link annotation
    • http://parcroyale.hk/userfiles/kanozufamowakuvabo.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14387855232.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/rekozujawuzetoxobe.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/28429358152.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/81442af63acbefd1740afa34d1fc9b89/wevoxudepiluvudivoto.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/47fe615fa7886f4e7e157291c8dcbb9c/20712520729.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/bh8tu1smgmau5614cvfsllff33/niremaxukomobaxa.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/pawubajuz.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/61654422273.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/nozalaxane.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e53932241---koxafagupopukolurexin.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210730014439556781gwkwnc.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/debirafaxuka.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/39387257736.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/gaxaf.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/71029572953.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/8440521815.pdfIn PDF document text
    • https://gilbertems.com/videos/file/33673797377.pdfIn PDF document text
    • http://www.fk-fudosan.net/app/webroot/img/userfiles/files/20344920723.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/lekanejowafobexibokur.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/96054475004.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/2c72qa4k988bbu5j4fkr8hj8eg/17835316930.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/6pf3p6gphui8pv37bbc2ck98k6/19431779323.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3b07875916155bb000a04a949972870c/94434905446.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_off0000c1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C6 10988 bytes
SHA-256: a2206aaf14bd351d38fcfbee309ae3e8c7543482d260ef02696b7be85da69206
font_01_sfnt_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 16448 bytes
SHA-256: ee0e7f23ccd96d4620d6950200f43bd8184fde3cf7cd0b0f73253efb47ad7656
font_02_sfnt_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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