Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e937cd9aa8662d4…

MALICIOUS

PDF

76.3 KB Created: 2021-08-08 22:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f68fb7c9ddfa4ff8bcd4fd3a47dd7c13 SHA-1: 3ec3a07770d5b1c4bcfbfd776e7014788dbe3020 SHA-256: 2e937cd9aa8662d44f8ff7bb25b781884aaf82ada9b0269292b7f567698bbd9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress sites acting as download locations for other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

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 https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/vv5cphu6codtjhlksgekbfobo1/lafufimoropikawudo.pdf In PDF document text
    • http://capitaloffice.pl/fotki/file/muwaluvepe.pdfIn PDF document text
    • http://www.celso.org/download/dimis.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/vukurotemozu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a822e50fd---30462223231.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/24abm2rdkafna5uhpldpnaeb40/56623692081.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/zuzuwunav.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/7e0b6baf678c37189463b479903c3e29/nuzemujogivi.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/65202457838.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb39bb84d---74342965607.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/kivonugifozanewamavelovar.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fu5pgrefck86hgnvkcuv03pa8b/wolifijaluxakuwafusimokek.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/71520482898.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40651566428.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/texuwebagapifukaxipawo.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/31678101605.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/g95rcb953778av8uujkel2uell/napakigoremobizexasoz.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/nokepasaxan.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/67546841799.pdfIn PDF document text
    • https://palet-school.com/files/files/vikafuruwaragajifenezoge.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/8615684873.pdfIn PDF document text
    • http://premium-t.info/files/files/fepezipisubip.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8514d3689c600a8e0313218df22dbc88/80658489581.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4e0e2873---xureriro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=california+dreaming+menu+and+prices+durbanPDF 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_off0000c5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 11136 bytes
SHA-256: bf16b03203a2b76f83393e26b1fd8af72fbe9ccbdcad70c7fd2d9f1c2afa0151
font_02_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 17244 bytes
SHA-256: 9b898a1024df0d7f5c703b6f0bdcf1924cc4c5a8b9217475bcff270d0df01fd2

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