Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b5f3192b95ea58…

MALICIOUS

PDF

87.0 KB Created: 2021-07-18 19:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 677b5895395c0594806cad8e06a3f271 SHA-1: 4a16e1d1b90d842648cef497c94e216113fe907e SHA-256: 86b5f3192b95ea588990f530e85fe4c8027455af795ef399fca78bfa28ac8862
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other potentially malicious sites. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4abeb94567---tawut.pdf
    • http://inter-travel.hu/_user/file/minifizasotatolowaki.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c8dd5587b---80900087258.pdf
    • https://flyags.com/editorResources/file///8674633293.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/39254b2e60abdedae1132a822b825efe/gikol.pdf
    • http://orlickachata.cz/files/files/88958853164.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee419d6cfc---10028872981.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/aeb0b2913945a268338cd2cb63510da0/70206180039.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fa4f4e05d87e34a98ea3ec0cb4ed4c7c/8946907537.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e044e26eee9---relipav.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f83407cb05f72be45fe0e2e24a7a0f18/pixurejobofiteze.pdf
    • http://sjhrz.com/images/upload/File/63649580777.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ade7196dd24---83363283273.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a1d5e2b2c---gupumeperobuzi.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609729f0799e4---15221164929.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160abeb1fe0485---wifokoki.pdf
    • http://washchienluoc.com/upload/file/kolegakuzelazilapubijinom.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d579c755e---54930528987.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/894c259e166c472df5c401a41e338b90/xodubujutafudukasosut.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0306c26425---medezopebixesegade.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/crdqrlk00ni5h14gvd73h5adki/bipor.pdf
    • https://topaldanang.vn/uploads/image/files/tidatevenaduwezisavuwe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=carnegie+skills+practice+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef74.bin
9f1330af2963e868da22ecebc51e48bcf7cf41ea2f7378060e84c72eb6e08c5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 10640 bytes
font_01_sfnt_off000107fa.bin
50d058ec9a035747ad940ce9fbf860700acbd9fbb3eae240316ba02ec0d1917d
pdf-font-stream PDF embedded font (sfnt) at offset 0x107FA 17312 bytes
font_02_sfnt_off00013527.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13527 16792 bytes