Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15d616cc24c0cff…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 18:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7438c61e8f347a2d5db3c6e8b10f7920 SHA-1: 0776553209ebdf7a6db00e1f86563959e50070e8 SHA-256: b15d616cc24c0cff093984c9d0128c63a6216379cc0e611df073865638af4ede
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.solarwindependence.com/ckfinder/userfiles/files/wimemujimadixin.pdf In PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/nelinorolepetub.pdfIn PDF document text
    • https://10fci.org/userfiles/file/42303696638.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/kiwevofival.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d5e7e5f48---24986447838.pdfIn PDF document text
    • http://rinsacars.com/files/others/48501478312.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a1b8326b74b05df3d2981a8f714de393/64845537275.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/11256989031.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ca7ea046---ronuz.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/da0ce772bb7a19eeb879a8ef239f7922/99924319947.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/cjj7iolbpvfavds8afupoa49q0/fazukikapetowabuvilodowaw.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d436d2e3a4---fibilinadixex.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/bomizoredekasasojiwag.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1349462060f0a8917970a.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/xoworavizerilakifubon.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/64451944234.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/sutapedigoko.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/disozalumid.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/dezavu.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160762b68de349---55060470032.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/daliz.pdfIn PDF document text
    • http://sdes.in/uploads/tanegigovulexojad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=calidad+de+vida+de+los+inmigrantes+en+chile+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 11164 bytes
SHA-256: 2029ac9328ff3188914cd9f7e06c32c96f1275b895e8fc018ea7dcc4e8de07fc
font_01_sfnt_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 19152 bytes
SHA-256: 3e1b82d037e36a4b085d9297defb5bc77fd8fcff3000d589cd295743bcfb4a9f
font_02_sfnt_off000124d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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