Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f87c42d00e93b35…

MALICIOUS

PDF

77.0 KB Created: 2021-09-01 17:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66975a68d20c964c207466eae20fa657 SHA-1: b1d275b2707542b22ce1455680dc009f5ba764f4 SHA-256: 5f87c42d00e93b35add9903cd3e20d4a9197dcde69ad1c2fa417ba8120eb8e80
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 numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and embedded links suggest it's designed to lure users to external sites, potentially exploiting vulnerabilities or delivering further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607998b5ed13b---53467252372.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4307460e7---97077392882.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b489a8a9480---zakelusetazejitoso.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/39745567709.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-21/20210721082336970486.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/76831502064.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b82f180232---wapinit.pdfIn PDF document text
    • http://allycatering.com/userfiles/88027213523.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/rulepivomojenaro.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/d92edcb66dacd0ffe2036847f3e5596b/mepogomomuduviludojimawel.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/bubuzuzupafeberibo.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8953729122---koterapafe.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b636b7b1324bb8eadd55dc70f6018f87/rirajoravizij.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/898a8834b36642ad70641f152e02f7ba/47473108976.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/vafozatulosajetom.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/26204c40da5ae7c84e1fd5436b458099/79638724822.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/93784667240.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/26525124793.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/jikimikureg.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/63021058941.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e7937d0f8---durisusax.pdfIn PDF document text
    • http://novichiha.ru/pic/file/17462359502.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/23262571686.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/1172139ab6245f509fdde73e45be1e48/18074455762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=glory+rank+fabledPDF 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_off0000c87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87A 17680 bytes
SHA-256: 34e92011683db6d38802ada43c5d81dc99e1f2eb2504307e8d184e089b88623b
font_01_sfnt_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 10376 bytes
SHA-256: 2b1aa3d9d3a1bd5fb072f328f24746fb9af0780e4276f820baab936b7de8b0cc
font_02_sfnt_off00010dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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