Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a872dfd6cddac5e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 14:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6471d01b3632a3204340343e3e0085c2 SHA-1: 2e3442f42edf0093eafd5f960e5a8894b4ce6e86 SHA-256: 0a872dfd6cddac5effbb8b7f43363f2bffcc7701870e5a6f4a2bcf227b80c907
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the PDF is part of a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=beautiful+creatures+book+1+pdf PDF link annotation
    • https://mariellatriolo.it/public/file/voxikejukibafamo.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/mutisosejosoxefedupoli.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/vanisoj.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c879b9d9250---punum.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/juwetafufaxego.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/75298841048.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/bcaaf360dc04a411451667b27861bf79/2161323472.pdfIn PDF document text
    • http://asvpp.fr/pdf/xuruwetuzaf.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/76568611959.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/587c4a9c515e236461664b0c8d49d946/pujojixu.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/vitanaroto.pdfIn PDF document text
    • http://livestocktool.com/d/files/41370732246.pdfIn PDF document text
    • http://health-bridge.in/upload/file/wabadofizig.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/555bc7c1c9118b8d0b4411a19eb959e6/nopivubojinefuw.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/p30tu65nsh18mnsel1m1jgr4ub/pikojutugatine.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611a5b89f0a6b---somofusimuwisokoferevemax.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/rerebofenafawe.pdfIn PDF document text
    • http://abnicum.com/files/file/midari.pdfIn PDF document text
    • http://darstin.com/userfiles/files/tonajoduwanupum.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/sawuliwumobemoliwope.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/vodutuvijoraveromet.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/59650695334.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/6300883021.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/nufikeg.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD703 19516 bytes
SHA-256: 9475dd233b30e7ca73dca6e246d6ac8142a270d60ef7fa5da2485719cd6b07c6
font_01_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 10944 bytes
SHA-256: b0f39c4ea9389538409d871cd9431fdae850f37879323952481a437a84631dc3
font_02_sfnt_off000121e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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