Malicious PDF — malware analysis report

Static analysis result for SHA-256 da234a07123452ca…

MALICIOUS

PDF

80.9 KB Created: 2021-07-02 23:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d79e83eddebcc4f0aa6ea5865de85c3 SHA-1: c1c1e956c19d0f54f883d6eb4a924d3f7ca0bde6 SHA-256: da234a07123452ca1d60ae176bc33f1b0044a8506fea9cf803f6893a2d5938af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c07e69881f---19003813425.pdf
    • http://backupcenters.com/userfiles/file/zugadosagonofetugemifike.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98371240b---sunijus.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767a448a571---65122470606.pdf
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/xoludiwaboni.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/92435986641.pdf
    • http://yaqeen-eg.com/userfiles/file/buzapo.pdf
    • http://palami.by/images/file/wobowoluzumefugim.pdf
    • https://xn--fiqa735be48e.com/upload/files/kuwobased.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/50591586745.pdf
    • http://jiuxingchaoshi.com/uploads/file/27225301568.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868daf0a6e7---wogibedumonejunovaseji.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/dufopose.pdf
    • https://nbtele.com/en/cache/fck_files/file/63408216814.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866e08d758a---38290141344.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c74c972fce2---333306587.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/cnuebbpv1it5v2g77pu420449a/mekesoliredojodofosoz.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b451409aec1---wowawuzavemafotinojivig.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/29a40ee28b2285d159cd0574850f9a39/zavoxesibutilurorudufi.pdf
    • https://rocksoliddesigns.biz/userfiles/file/pudikosegekulewuxudon.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a60b8d989---39320542155.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/rovq0qo0en3ffql6j84h67vee6/88011667420.pdf
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/xoveloverirarusakow.pdf
    • https://gemwares.com/userfiles/file/65892055531.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bibliography+for+school+project
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AD 16792 bytes
font_01_sfnt_off0000efc4.bin
55173dd5dfdbd5bfa5e6bd90ddf06e1d25c622bd107e36da447444a435de933a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 11092 bytes
font_02_sfnt_off0001098f.bin
393f1612fd9b9b6aa2d5d82ca600bd9ce2adedd98652d4c4d039152b6f7b344a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 17396 bytes