Malicious PDF — malware analysis report

Static analysis result for SHA-256 78217bc8a5733348…

MALICIOUS

PDF

165.3 KB Created: 2021-06-14 06:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9a50bfc866bf49f9ade7a3fb065cefc4 SHA-1: 0d30c982f9c3cf3b7afd3f8922fa6b127deb6c2e SHA-256: 78217bc8a5733348d481627c5cb75bc066a4dba3edbe02d8fe5cd24b1358c907
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=poe+unique+shield+list PDF link annotation
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/8be3cdb1274174315363405ca946df3f/wafovizemuwekefukufi.pdfIn PDF document text
    • http://www.celso.org/download/kebuxegowufabuxokijo.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/nekozomukedokowinenal.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8aec9e52d---merakajanebobimepituxapun.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609165d53a969---42738030898.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095ccbf6c77b---desejoloxemu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097e36f74b97---kewizosedizum.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/61a30331f4a0570581240d94088c4255/xuzalasepegunufagi.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/2gmbvt4pebpuslms4ncsvhic16/40688409525.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bj0hr6f1m0p7cu3cdo7s05vh22/29691520162.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/457c614bd1f6880a4c34fdb93ad3a6c8/30117898943.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a87cf64d27---vikawafawu.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/f8eda2e8c5938eb61c1238b986b5f96d/fubedovapulame.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/766a0166bf3ba0a689ed765e1424194a/gikusonitatasopepidu.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160703f716eab2---lifobilazexebemo.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4886a5b28---pesozeritirorezixuvogod.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b886e55d0a---bavamabem.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5146ee1b50---12602514023.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002087c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2087C 10868 bytes
SHA-256: 90f4827f8bf1692139772ca3ed1493fd2b0bbe93098ffeb21e5d68ca738901a3
font_01_sfnt_off00022cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22CB0 4732 bytes
SHA-256: 2e1348e99869fa392b31962084f48982795bfcafd4364f94a421da7a4299f497
font_02_sfnt_off00023cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23CC6 16836 bytes
SHA-256: f09325ced5ff4ab3726bd3c3240a4e63ab0bc5b6c5523ac6d21fcb5bfbe29d01
font_03_sfnt_off0002720f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2720F 16172 bytes
SHA-256: 526177ef816c6165251276cba9d37c9cde58c758a098f93fabcc535992017e36

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