Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7dfd69eea224dc…

MALICIOUS

PDF

90.0 KB Created: 2021-08-07 12:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c5632297a1c0c8890f5a242c53a9aa11 SHA-1: 78f7b5cac307553670ca94f5d681c6499099edb3 SHA-256: fe7dfd69eea224dc8ff6a024ca60a15106553961fcc40ace27fd24ffac3f789b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate that the PDF acts as a link farm, directing users to multiple compromised websites, including those hosted on WordPress and other disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=breve+historia+de+la+literatura+espa%C3%B1ola+navarro+pdf PDF link annotation
    • http://se-ty.ru/uploads/userfiles/file/88620390517.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/ede8c2850b7be974f257a27d9c460a66/dafotatonufuj.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/nusuvol.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/44661601772.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c69c8a553d9---fofisite.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/kimuginexozoviwunadub.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30a6571cfb---xerizux.pdfIn PDF document text
    • https://777mto.info/contents//files/41486944802.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161008e5a1c18a---bubokinafi.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e7c168055---buvigifemosaludiporipoki.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2643c974c---13185758310.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/34109259660.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/xamobipipanerorukunen.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2af5554156---pisokogepaz.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099573d31317---nalawukabovobolitubuvega.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/2889481987.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16077f3c4895eb---68650342455.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/963da6c5c9ec4e36905cfbf8efcaac36/fijatusedexi.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/vivawopixanetogoxup.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/973db716c2a0a4c2dc26e9a8a679f5f1/gixavijifumebev.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/pavijovivapapoxilujapageb.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1644919148610037fa66539.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 18720 bytes
SHA-256: 79e98e5a9d6406f74abf6fa614c3b30d66bb77acbb1fbed37c94c9dc5277493b
font_01_sfnt_off00010fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12801 11020 bytes
SHA-256: a0b2ac1a5d0c0443a1f214f050ebbae8171eab7e1aa3e8685dbe8c49e3c64314
font_03_sfnt_off00014162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14162 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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