Malicious PDF — malware analysis report

Static analysis result for SHA-256 1101dca082745a2d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 23:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d80471451fdfded461c47cf73937aeb7 SHA-1: 513a73549875201bca9a932c9005866531a721ef SHA-256: 1101dca082745a2d6be0425248c03e7fffcefd207b33385a154d0deae6ace922
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the PDF contains a link farm, with several links pointing to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://art-eria.pl/mandarynka/pliki/files/mugajilodazigawujibewe.pdf In PDF document text
    • https://atlastoursntravels.com/userfiles/file/luludarelusewuf.pdfIn PDF document text
    • http://espwireless.net/uploads/file/fabenavot.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ddfee1baa0cad06f2e9af23c637c9671/wasadununira.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313ef583c75---36772150586.pdfIn PDF document text
    • https://mlspoland.co/files/file/92255629578.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qb9mor0o48atp292d1v222peup/70147244930.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210910012517.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/52090365426.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210909065957_2070884096.pdfIn PDF document text
    • http://gysanya.com/upload/file/210901231225494077knoe9vuiua4r.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/busogakiwenem.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/18410572343.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/68786240171.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/28216163627.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/tilad.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/wexomataxunamafapukosan.pdfIn PDF document text
    • http://apcmagon.com/userfiles/39869224709.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/27001217013.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/73217809499.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/leziwariwusipen.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/38811068970.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/70339221129.pdfIn PDF document text
    • https://produse-zilan.ro/files/puwizerenuwek.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/28369470481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=safest+applock+for+androidPDF 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_off0000d868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD868 17524 bytes
SHA-256: b2764be55368c4ae28004b8238582042e853a04de1aae46bb74ad62e3e7a763c
font_01_sfnt_off00010578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8F 10780 bytes
SHA-256: 82b9d6f77e3f62c92a8457053cb8033400b436bcc8796411ffaf220868adeebb

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