Malicious PDF — malware analysis report

Static analysis result for SHA-256 6188a4b055e19587…

MALICIOUS

PDF

85.1 KB Created: 2021-07-26 08:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: abf9f49dd9ac788008ece787092fed66 SHA-1: 5c8f18b84be80aa90119def537cba25893cebe58 SHA-256: 6188a4b055e19587c4d977034e4c492cf1ecaabffbba3e23c2dd1b79c4f0a80a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://osoboebludo.com/ckfinder/userfiles/files/25005077370.pdf In PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ceddcaafedb6d03a752ef6ed793ba69a/gulujaxuzejefege.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/96778416797.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082b498463eb---60189482037.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609d18d94f19e---refilubomopugo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0eed84ea7bc0ddfcd8a65513aff0a343/wifuvapepudefuxozetugulo.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/41148068597.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/sizufusepepurasetafozite.pdfIn PDF document text
    • http://remobudostol.pl/pliki/23983053072.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/pte13kr56o4q8n38gm07j0p3ef/77584849641.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/juzokituxanajelojoziludit.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/rp7vcb1quh3th5mvknag90vceb/vebotorezozonexez.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/kusibupajuruterobakuri.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfd714038e---nozugoja.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b744333e3---47279064601.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ba14ab0cffc---59682503026.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971a3fd12f9---zunakujokiziberofurikako.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bf58c28c897---gorowefitos.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6781b3d49---geliviwabiwenasevegezurej.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76e42df391---zalawixadome.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/numinuwojo.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/81026c8842a553d07dc459246b36bedc/feliwumadixodejufozumod.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/katopukovavukakij.pdfIn PDF document text
    • https://latework.cz/soubory/84848587270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=a+series+of+unfortunate+events+book+2+free+pdf+ebook+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 18068 bytes
SHA-256: 713ee698b7dd7477e6cdead7ad2e65754c7aea1b50df351301e654710998e5b3
font_02_sfnt_off00012bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF1 11076 bytes
SHA-256: fefffb053cde9ae6769593ca29d59d0a5ee91feb66d444283bb469eb2aac442b

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