Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a9c0ed104f73d9…

MALICIOUS

PDF

84.3 KB Created: 2021-07-13 18:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e707a18529da1a29d0e2c54dc2a3628c SHA-1: 421595305c515d38119cac0da220291c00210783 SHA-256: 66a9c0ed104f73d97f90d4d2aea7b1c355bd0f953a36967d7b9888419fed3862
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other disposable hosting sites. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=different+parts+of+microscope+and+their+functions PDF link annotation
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075ef6d9ec0c---bivabubetidusujumorokibo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/be2da3382c9dedc48c7f96a07164ca47/towexodowiwoniwiju.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/gufabojadiveje.pdfIn PDF document text
    • http://beta-rc.com/upload/files/82033699679.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1553ab612---bozivunagujeruzeg.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/42f7b237ea8b811cde401288061fa8d1/82048081398.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8dc39c64a---39565329197.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/58946634141.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/5i0chnlmcjkpbmpdutoucmsdjc/4590684113.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/vomowaxotidukilemugod.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e5ca06b7c---jerasu.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/41232431302.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/67465678708.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160de2f6d2c117---90565017585.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e234d8f77---41524246723.pdfIn 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://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_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 10940 bytes
SHA-256: f0f770883c80ff6a9dc0e99c0bdb62386e29e9b94652776643f5d38b8c41eb29
font_01_sfnt_off0001020c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 16212 bytes
SHA-256: 65b553945b0b01991a7242499674cf21b08464aa2c6b74e2d539b5e9c19a9216

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