Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7721679bd33255…

MALICIOUS

PDF

92.1 KB Created: 2021-09-06 09:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f4af9119468ecd0ce7ec505399bc2765 SHA-1: aa4fda8e9e048ce6835ce0f9dd222ac8067989a8 SHA-256: db7721679bd33255336601d22b2533d7fb7ba1328f98e270f54b3c1241db6902
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it exhibits characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download an archive and provides a password, a common tactic to evade security filters. The embedded URLs suggest the document is part of a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://krisoc.ru/uplcv?utm_term=historia+literatura+universal+pdf PDF link annotation
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/165040cceb3785bcf1b18f40e3e2c04f/60633511709.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/69769205652.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100cd1990f47---51015374246.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16074bb9ad7ee9---lavudanaxewenekesasigute.pdfIn PDF document text
    • http://www.moyekolodin.com/files/7693815777.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/dudisoruk.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/62d285b25ec650ab1dc419f0b9fca2ce/45888785465.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f990bc998b3d41eb0c8c8929b6f3f5d5/vumalobidujuxitorovukas.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/nedojunewadezixixumebot.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074a29317e27---61491302503.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/bt7j88t9ha3mh3kugbjv8u8ism/67561755220.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210717101202.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jonmff2qekrt24g8hngv2b6hd6/fobekulu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160806b7b2145d---nozavexigekerolemasef.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b3638a730---31739984221.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/44359088863.pdfIn PDF document text
    • http://liily.jp/upload/file/20210722151231.pdfIn PDF document text
    • http://vswet.ru/f/viponerebisuresog.pdfIn PDF document text
    • http://kaies.cn/upfiles/210607154815710477eceg17.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4555eaac9---volusiwi.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/97676331078.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/meneseloxazirujetevi.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/49688412888.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/nopikifapuwefaliruxob.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_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E9 18792 bytes
SHA-256: aed48f233b3b728547c0488b777105b5699fc7129abb195147948a9071376470
font_02_sfnt_off00014a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A29 10648 bytes
SHA-256: 7626609e518363eb0f0fa3b1aeabe90af2a427f860d52fc600130552e2cb5539

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