Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6011eddd5f09d22…

MALICIOUS

PDF

79.6 KB Created: 2021-08-31 22:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27106d24a745f05d8f063f3aeca9f0a5 SHA-1: 345ee20f27a0b090918b6665ed02f44ad7545539 SHA-256: b6011eddd5f09d228b13684f962ac40c0722a25a9db6f6553bd0cd098e975803
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and link farms suggests an attempt to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=girl+on+the+train+free+download PDF link annotation
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d810693dc---23155762939.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/61761036430.pdfIn PDF document text
    • http://merwepizza.com/upload/file/50341048572.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/pebozanoguvivawuvorov.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/temubejo.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/denip.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609022c39c0b1---sumujutuwoxebidunave.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/22efb0586f34927cba1699e8ad7cbfad/44770537679.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5cffe9d37da048cf1305dbf03b076bff/jataveluv.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/90022039540.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5201d9eb4e1810c1a7ca7e8eeca48d6b/1061736312.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e9437d8a526005b210a5666f8daacb70/zavugixomezuti.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/8jo03rjh9c45csh6jkgfgn91o4/nafizitasivogifezedeseso.pdfIn PDF document text
    • http://moneymaker-gold.de/files/76659290349.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/45735660591.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/37c7ca48a7e5b4291c1aad1024eec0e8/kotakutegipabixose.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/15490059273.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/24790173118.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad0a8939c8---sunodajipapilivaz.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/585d792f5a809a6d35d67d4a58b47a1d/zukolezejufeweputorubo.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/pagitatilozugopopike.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_off0000cce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE0 10408 bytes
SHA-256: 6058794ccc641240f0b0c26a484fc23f3b8cce17aa474ed5d7d34376f64491ad
font_01_sfnt_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 19120 bytes
SHA-256: 627cd6820c1b425a5c59c056b9f21f6f11c3669214f673a28d011aa5c6ececa6
font_02_sfnt_off000115df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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