Malicious PDF — malware analysis report

Static analysis result for SHA-256 114d73d86d6d2b7f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 05:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a17a6151ce49e23ee52aa906f3ebe1e9 SHA-1: 7678fb295f4068bed9ab80affc3ce2288189b746 SHA-256: 114d73d86d6d2b7f433140e68354454f006e274ecf8da2e37c81b0bdb46b4956
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=clone+hero+the+devil+went+down+to+georgia PDF link annotation
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4dd430e9678dc76191c52fe2d17a3e0c/70806338528.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160774a748d760---mikixajadewuwagusek.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ac13d215f1b203cf784c53e02b0e3b4b/79487268980.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/leletifipufomalunamure.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/bekazi.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/9e0a4bd1001017b584dcfccc54c6c9ad/23366673905.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a80160d91d---nunonokobog.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099150be2fdd---ganaki.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/rurituwekarelokadomewe.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160714f81be8eb---20381111771.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b69712c93---poxesumefarekanexagozafab.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc904cb38f2---manajubapevibewiliteje.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/torabafujijatufaneja.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/nasuruzoropo.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/jubixe.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/bufanosujofinunuriwogel.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077d77e79661---sovigixerematubovofabo.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9b2c5d252412a8f80321e3137a252cc5/jamakawexopajaraxibe.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d91bd03125---sugefojusazegibi.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/39080303074.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/30866799679.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/fusevogasawakatakesuzexu.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_off0000d3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 10544 bytes
SHA-256: a363cb5540096833cf543dafbc360279f8788ab5111f363a21a322c7f2a6ff78
font_02_sfnt_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 19912 bytes
SHA-256: 30c4a1a03b9c5cdf1d02bd418a14249bc618b11e5be61815b373a6127f225965

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