Malicious PDF — malware analysis report

Static analysis result for SHA-256 90245a7147403a31…

MALICIOUS

PDF

80.5 KB Created: 2021-08-23 19:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28314ecbbd4914bee67c3a73f61c1ae7 SHA-1: c94687b4f209a47be0370b4efb0a2113b76d575a SHA-256: 90245a7147403a311cc131bcd91f51b8b092e81acbf96bb1a794f3203b818313
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a malicious PDF designed to lure users to malicious content.

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://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/008fec04cc03049e54cbc1d4426759cc/26628463855.pdf In PDF document text
    • http://aftckwt.com/uploads/file/mosifewube.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/78894890710.pdfIn PDF document text
    • https://aspirans.com/files/file/xobivamiduxemoporidijumi.pdfIn PDF document text
    • https://ecoretras.com/file/13716636480.pdfIn PDF document text
    • http://ruresept.ru/files/file/23062155447.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/27948511336.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1f6778186---popumebamezolu.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/49923518131.pdfIn PDF document text
    • http://nhs1968.com/clients/65482/File/lobazotujetafov.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/geganune.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/52385372807.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a753be6ba05e82e6f64f5b7d247d1718/dobutalolelerakukepikopup.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/18673698033.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/8o5f0bcbq8n4ko0mqqiq6td9us/lowejidesewixilise.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2efa64ea1---10542504909.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/28544840639.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/nutofodevafixapojeno.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5a8bac8a5c1137a0c0581ff958cda9e7/37129605308.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea21f612d7---89278571638.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///27673736518.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/heiqlj70uuitblhnuia3v0kopm/pawasofati.pdfIn PDF document text
    • http://cga82.com/admin/File/52399808396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=simplifying+a+quotient+of+square+rootsPDF 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_off0000d666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD666 11136 bytes
SHA-256: d933d9d9ae17dd19c3451bbfdb7f05fd9b0f6d97701c226f9ea527367ec21194
font_01_sfnt_off0000f01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 16712 bytes
SHA-256: 5cac26e5533b549da10bb66300cfad9b5024b85de31b025dbeace6f7adf99b53

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