Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9f1c7de31d31cd…

MALICIOUS

PDF

70.9 KB Created: 2021-09-05 20:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb00108faa67f720699732c5d0e5f72c SHA-1: 3007d86054f451b2b987841104c8bd17573c32e3 SHA-256: 9f9f1c7de31d31cdadbe118774c042a7e4053303d394b2bb3655690724cd53d3
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute phishing content or further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this, indicating a tactic to obscure the true destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crewmak.ru/uplcv?utm_term=artisanal+fisheries+pdf PDF link annotation
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e98284b59---waduwebibakujanunutuvisat.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/5178586299.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/jifumoluf.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/jomobugokerupapapo.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/dunerekobu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e265efbe1---jepepupavijijexatiwezid.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607677b80304d---73861686922.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/javokifemapanikilug.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/balisarapuf.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/36078190757.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde33547800---jumezoledibifirapakum.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9b2236a7d---71721037794.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/fovovejojejaxesedana.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/16747422060.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/18767175101.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/aaaac9733b43172369e9847723b6d466/bakogojozezijaxigek.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/gexavu.pdfIn PDF document text
    • http://katachizu.com/img/news/files/xinabepe.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/77511200854.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/tixukutabugiv.pdfIn PDF document text
    • http://cloverdiamond.com/file/27700629751.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160885573e9f0e---9843721784.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_off0000b51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51A 10456 bytes
SHA-256: 6bd87addd3c38b1c1cc242435380ae2576ac1832d0b1160709798664a0f8d18c
font_01_sfnt_off0000ccb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB8 16472 bytes
SHA-256: d4d444a4a0f8691053b5acbc6037683b04d2ad330f80695cbce8f04d9c978b69
font_02_sfnt_off0000f608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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