Malicious PDF — malware analysis report

Static analysis result for SHA-256 57daa51c048ef1c0…

MALICIOUS

PDF

87.0 KB Created: 2021-09-10 12:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2c91ba93159f39c96aa22ad6e9569527 SHA-1: 2d3317290b619bdac78a797e169d855e8931261b SHA-256: 57daa51c048ef1c0f8c54b3b5e3625163cc02faf12e0d2751b7c002d1575b16f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous URLs, many of which point to link farms hosted on potentially compromised WordPress sites or disposable domains. The embedded JavaScript is likely used to facilitate the redirection or further malicious activity associated with the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gamax-moto.cz/data/dokumenty/52425929917.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/or07vrk32qhn317ent5iaease6/36301046802.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/3300394787.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/40167507474.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/xejuwefenukajoruzeviwubeb.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/kuzobebumomakifuweberu.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/jobulugusi.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/b2473d370985cc170265df7598cf4d50/80160770734.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/tasogezamekepamugasumasat.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/motamuvi.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/cb1c45676a29c9184fac45c91eeb9e76/jezomokurubukujiz.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/ruzarif.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/vemofujotefuxekitilalak.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/togutef.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/76083552722.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0c92337ffc5bc6714017876d83ef88fe/fibuwoniv.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/bikaturojusobenuk.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/97800850793.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8d8722fdfc969f3caed6d1aff07cead2/27608051484.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/xafinupemelapafola.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210907012134.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/tisabituf.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/6566449019.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/lenazovodabataje.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/34106701810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=image+to+pdf+photoshopPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 10556 bytes
SHA-256: ec494c084a9a4b2461c8220a3ba4f8f87bc11ad9e4cd0f597e0fbdd84bed812d
font_01_sfnt_off000107e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 17888 bytes
SHA-256: 58101d0757e921a37b4e20920867c14fdf359274fdd06367a8d1a26c6b4990dc
font_02_sfnt_off000136c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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