Malicious PDF — malware analysis report

Static analysis result for SHA-256 c105cd6902986879…

MALICIOUS

PDF

84.9 KB Created: 2021-08-15 19:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: ea340b3eeb131e33baf84818cfb0f674 SHA-1: e9e82a10c99cfc9b728cdb67b80e039ec545323a SHA-256: c105cd69029868797719bfc88151eeeb11ea55e4da329e4c7308047eb52140ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://synerhu.ru/uplcv?utm_term=jerarquia+de+operaciones+ejercicios+resueltos+dificiles PDF link annotation
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6j9levpvkqgl49el3dqadhlu35/dodoresa.pdfIn PDF document text
    • https://airshow-bg.com/file/68572445521.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/pepunenajixoji.pdfIn PDF document text
    • https://peterdegendt.be/file/13459085775.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nai77otf64nb63l8sha7gojuf3/fidazi.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f1f2e4147---93291017355.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/jixafobefe.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/gopapirizejugolozon.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/gfeda4nsd19pqgpe0g70t9s1a2/4811677966.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b9505b3c7---83442644944.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/26549554671.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/noravewobesepuwefinokup.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/tolifisusanumubilagologi.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7499120de1---towidevarelizegu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d4a78aad1---fixupitapezaripeteb.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c57c6482a---57197828626.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/88804948421.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071876f4dcbe---nolepovowisefun.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/bogulo.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b6e43b677---pedetanixinuziba.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/cf8f7277980adf7e4a46f88efb1a3d6d/gurulipasegulovazatapeg.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36b380d7f0---34214547706.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/bewikuzefuxux.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_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 10980 bytes
SHA-256: 69a6715972ffe1609b143f7c71e81c880fb53505fa0bfdad6b5b8e5af34ecbd7
font_01_sfnt_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 19364 bytes
SHA-256: 3c1b59e5867ae466460bf27e88f3bee6bca6de71fbfd1dd64281bab90320fe99
font_02_sfnt_off00012ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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