Malicious PDF — malware analysis report

Static analysis result for SHA-256 29113a52b94dbf54…

MALICIOUS

PDF

98.9 KB Created: 2021-07-30 23:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8cea18ad18b8fec19bd375462d27673a SHA-1: 552dca46db491de0eda1b53317fd9107a55c7500 SHA-256: 29113a52b94dbf5488ca57909c83f5b5df54bf97af1bd17855f05095e2ea921c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://gruppocinofilomarsalese.com/userfiles/files/bejopekibikujujoxeledit.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/acb793f18160a8bee185dfa4f23efff1/ditenasa.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/gebakagojos.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/mapadexikirafenofixuvak.pdfIn PDF document text
    • https://best-label.com/upload/files/filugifagofosopijo.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/482402988.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9322ba9f9e1cdfce3e757c7f4b9483bf/xalukokomipeletakoporujin.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b98915e584cc625ceed97d0d4f3e7121/nenonu.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c306b6da25c---83014886989.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf928c213a---bumuvopelas.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add68571200---duwepuzaladusozifike.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/13441181846.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca5acf245b---48251408483.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/e4tfm9ib3lr17tciceg351mt81/10151797589.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9beac22e2f---puwaf.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/puluzusotikewawezaraf.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/c7275975ebec3792dfa641dbefa74d0e/85616347135.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4a203c784---2156476143.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/fawotes.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/11812497303.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b79a1acff02---81708193433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=parchis+star+hack+apk+2020+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 16616 bytes
SHA-256: 06f1d5f5a9083a80364da0885936c8ddb2848b41a67694407b5e75bff462a068
font_02_sfnt_off000121ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FF 19564 bytes
SHA-256: ddb0c022eba00891727cb6e49b94cc657e6cbc5128af4c35498e524b143a152f
font_03_sfnt_off0001553e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553E 10900 bytes
SHA-256: 37cf5f799dc740b8492c434cee007fa0b4b7a25dc04016ebf6f8ef0f4358731b
font_04_sfnt_off00016e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E74 2976 bytes
SHA-256: 3c16aa253afdf9121c185dd2c0cdbce2131a1be83c7d18fde28c79d8f9d1bdd9

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