Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b607a2760d036c…

MALICIOUS

PDF

88.1 KB Created: 2021-09-12 07:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b11b65c0c002e546094985f02e6e152e SHA-1: 8fb200381625a3b8e03dae60dbb995637fd07076 SHA-256: e5b607a2760d036c0153e71948e940795c8c9d0e046f5ad56f44f0b418b87387
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 0.9973

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://pistant.ru/uplcv?utm_term=what+does+beacon+do+in+minecraft PDF link annotation
    • http://kamennykoberec.eu/editor_uploads/system/files/96406180913.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/42205689215.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/bd8c5b0267acc46df28df7c12e63f97e/tonoku.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/2e500fba2bb74224c32d7eebbee5676c/63232933685.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/21e52f3d31910f33894a708124db2520/34572977647.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/lelumibixinarixefusisave.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/nevixefotezilo.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/mujatuzotozezosixate.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/27040528feb7460c3c8bfc48c16c16b9/87069477520.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/92236618145.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/23209171102.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139719f8b2e3---fowofor.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/vilusopozaposiroxisasetub.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/juxefavelimusuju.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210910181020.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/70598738111.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c35205133448d0a068d7a2fdd1598fa3/8598097392.pdfIn PDF document text
    • http://medica-brno.com/files/915443725.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090701503773499.pdfIn PDF document text
    • https://equalland.com/uploads/File/lidakov.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/romugivovutokosav.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/100454564324.pdfIn PDF document text
    • http://afro-safari.com/upload/files/32631774052.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/vojufubin.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/5728146574.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

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_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 17520 bytes
SHA-256: e9da05802c919605fd9f55f64482211e7b776f2e6c2a8929b2b9fddf1ac09feb
font_01_sfnt_off000121da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DA 10828 bytes
SHA-256: ca7911b7cd809ad7547165ab7c6f29ebe4043935a211a7fa713281fefc09f8b1
font_02_sfnt_off00013aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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