Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3bd1cd73f25036…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 04:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ca4013ad0b51246b8a4772422ce1ed22 SHA-1: 5067bb8511f149cfdae6e0529d430097ae0052ea SHA-256: 6f3bd1cd73f2503677f0b182f678ed68dc66a5759bc7bd4d2b6ae4bf28b5e555
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of creating link farms on potentially untrustworthy infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/65405567695.pdf In PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/70901342756.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/gokinanojuzigaposu.pdfIn PDF document text
    • http://dfanchem.com/upload/files/zeburubezekowuruxa.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c3140e4c0---fefikizagavemezi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab84e15deda---mumezexasudaxago.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160795602b03ba---biretujikogodudulagusezew.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/24767250760.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780e6ed9965---51153035215.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160929e72973a8---kafikeviwaz.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/86133613863.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b3919066835---34889373462.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/gowuzedukavafevowodi.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/8c064f63d3021cefc5a26ce709b23f4b/25199307280.pdfIn PDF document text
    • https://bauarch.bg/files/75603765737.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/pumaduveniturixujewabome.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810217eac1b---35360095649.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a517fce4bd55b702884a06208cf5b5a5/zisaxasifugevumup.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/59223911703.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab6779a85a---52023274677.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/emf6tipu6luf67ghr1vu65ha87/8127116572.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22774f556---83538978266.pdfIn PDF document text
    • https://ecoretras.com/file/54033485422.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b36df5c3fb6---42281737121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=leave+application+format+for+employee+pdfPDF 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_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 18212 bytes
SHA-256: 6494d4850462935651d0f1c954889d9576f6ed59b9fd822c2e4d9d8cc7535989
font_02_sfnt_off00013938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13938 10752 bytes
SHA-256: e219fa92284344d78eafffa38b09b336ed2019b506306830c93e1bea579d575f

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