Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08aa39914b5cd8d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 03:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91803c4dde6045b911f718618f4c1dac SHA-1: d0b84e5053a89f04bc75f888352d62695366bb31 SHA-256: c08aa39914b5cd8d19994332bde57427b2f1c381761a944c5fbbbcc41e1d11a5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple disposable hosting domains, many of which are compromised WordPress upload directories. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://adabaskimerkezi.com/upload/file/goviwogelojawelosidumipu.pdf In PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/17167618500.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16149256cf36a0---riwadopaboz.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/7491dd43c973f20bf878930546237e71/fovapipaxarebis.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/19466574327.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/pufupudovesid.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/54418711923.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133ceda19533---pedetiv.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/53036786654.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/87705403427.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/91743261919.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/votuzewosobijezeridik.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/68342968553.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/zixamokibi.pdfIn PDF document text
    • http://metallpress.info/files/26382842061.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/velowo.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/56651586488.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/murikexipeboruvu.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/tapigisutinidozapa.pdfIn PDF document text
    • https://ikansambel.com/contents/files/lefofevoneliwuzeperij.pdfIn PDF document text
    • https://beleznayauto.hu/galeria/pictures/43412670689.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/33020268465.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/88923057556.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/javubamirop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=convert+youtube+to+mp3+android+onlinePDF 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_off0000aecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECD 15724 bytes
SHA-256: 3cffa73aae6aa79137292e33d42c070c469d4ef2e50d3b4011f91ca80a834abc
font_01_sfnt_off0000d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 11008 bytes
SHA-256: 3b5d1a3beb403e54ab39d36e119af98063f9f682555c8debb64b15db182e6187
font_02_sfnt_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1