Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb3f1c43b362389…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 19:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5178fd52bdf4f840d9723a2119393754 SHA-1: 368c0a56b328413c370885fd829acc42816d450e SHA-256: cbb3f1c43b36238938500c9bec4a163ccb6ead114a8519f9c0203e9d61cf6a36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=adjectives+beginning+with+d+to+describe+a+person PDF link annotation
    • http://probeg2000.ru/files/userfiles/files/savizolituzofusamoxen.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/89130434751.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/lekenanirafuwigafu.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/79950451809.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0202223eb---88045617331.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/68012747074.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/31157742645.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/29777231390.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/21341343597.pdfIn PDF document text
    • http://webantikvarium.eu/tmp/jumaposaxuzawufuromujexet.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2e0b1fd696c059bb0c4a9c757b1e7586/dabozafipoz.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202197111511794.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/8606135170.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/85458722235.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b6ee89c71---95115289433.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130403a5e628---buguboxep.pdfIn PDF document text
    • https://baongochoa.com/upload/file/jigijosodo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5add18feecb4b38e7407a91a87eedac4/wupujazo.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca3a3d062d---57730371618.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/98074614774.pdfIn PDF document text
    • http://hotechike.com/files/files/jomosabasiniwonadatukobe.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rabuxopavoruwi.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/28703547185.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_off0000b287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB287 16972 bytes
SHA-256: 91a2b92f1d0ac903e60f024a3132022494cd1a160fe46980dc94ee74f9f3ebf7
font_01_sfnt_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 11152 bytes
SHA-256: ee7213cdf20787f5130731d33a43ad0652e97711df3159dd4f45259bebbca3f4
font_02_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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