Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c124383f03566b6…

MALICIOUS

PDF

90.8 KB Created: 2021-08-11 20:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b74ce8066a095e64027f5814386c0acf SHA-1: 4fed50730b5a987220c919d8f632a9becb58f08c SHA-256: 1c124383f03566b6ea56013aa0d92d3873b9905752f270115c0e7a3dab775a2f
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains a 'Browser extension / update installation lure' heuristic, indicating a social engineering attempt to trick the user into installing malicious software. The document body is heavily obfuscated, but the presence of numerous URLs, some pointing to compromised CMS uploads, suggests an attempt to host or distribute further malicious content. No scripts were extracted, but the PDF structure itself likely facilitates the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094732b035c5---28030901173.pdf In PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/4f4c5fdede232186099526ee8a4d4539/25859872478.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/76298414988.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a098efe0579---71115739649.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608127d7220cc---zejusimaloraragonesemume.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20beaa73f---sekalelazifaf.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/bovoki.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b576ca62d04---lijevijurog.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b22233299d---8741794269.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/jomimobulasufekizukene.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/25095707467.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/dejosijulatoxivariroz.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6am2466916sfgts6leq6cu4n04/navunufolimejifisexoxuki.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/83877367953.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb520d39e---19260924286.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee4f7a6d25---61848931781.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609882f30a160---47959114205.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076109da72a1---biwanufifunetaw.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/xenudijelubegiturosapira.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2269aa1a9---60223955981.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/398osk9v3smvjkvec94bt6g1g2/wetaxegixezulozuse.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/jamupajolele.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/25540987513.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/hr5559mscov9s33hqaijvpliu6/98047244786.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b7548923---xumot.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/wofedoxexafibafagupupubo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/39192224ef4cfa12716bae2438a0a4ab/22533459758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=adobe+acrobat+dc+serial+number+list+2020PDF 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_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 10992 bytes
SHA-256: d8bfb2f5474b8423b68aa08e04abb38c5530e5f480b3a3e37b03da9e310dce9c
font_01_sfnt_off000117cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDE 17368 bytes
SHA-256: 1c01a996e3c5ce2f2a435b0d3731cb241ed385d1748403996f2f56d9b254270f

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