Malicious PDF — malware analysis report

Static analysis result for SHA-256 54086785fb6c2a5b…

MALICIOUS

PDF

85.5 KB Created: 2021-09-15 13:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66117f7173ce81c1bde493967397420f SHA-1: 033e47a4b294e0abc1b209b221254b6cfc86cfca SHA-256: 54086785fb6c2a5b556690c4b17463a44dce2492671d86a653dc328df207f3cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cityfate.com/files/files/tesepamorixaxugaf.pdf In PDF document text
    • http://integrotech.eu/zdjecia/file/wejer.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/forugozobokorenuwewusaw.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/98047118026.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7bc8927ac42cdd248285fa986e2e2dcc/dinebalumuj.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f86996671e---69375051235.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/gepewaximekamoxo.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://bydnjl.com/userfiles/files/femukexoxifijodiwosorig.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/60088604206.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ep57k4vurs1gdks1f9d69h7ck0/peligapovivigipo.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/48424841846.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/kesegavawozokotubomobizok.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/jojasajebotelotax.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210906064829386813.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/filimasoxofax.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/kipajobin.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/banijizu.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/18247081048.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/72159228301.pdfIn PDF document text
    • http://stl-hk.net/userfiles/pasutewizunuxaxagusibuzi.pdfIn PDF document text
    • http://patroha.hu/file/kutezibokinigukefumu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2415db93---suloturolujunarawiku.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/13016249147.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ulk7p342h6ffpa065krbtmai7c/540822652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=fix+red+eye+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_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 17384 bytes
SHA-256: e5e99db2c2d46f5a46c28bd3391d008f24462be04af3ed6e2c23118fd6546370
font_01_sfnt_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 10124 bytes
SHA-256: e58634e6728065cb8806f733c811ea2379ce75162388a500825b4e5f6e0322d0
font_02_sfnt_off0001303e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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