Malicious PDF — malware analysis report

Static analysis result for SHA-256 343c3adb8064c210…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 16:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f813bc4a97694bef033f566d44e3df9 SHA-1: 709daf0a918e0e00c31e865067994f492a645d5d SHA-256: 343c3adb8064c2104b6dc48c80c2bf23cb22e0f940451d4537bb13d63f6b8e01
236 Risk Score

Malware Insights

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

This PDF document exhibits multiple high-risk heuristics indicating it is a phishing lure. It attempts to trick users into installing browser extensions or providing MFA codes, consistent with credential harvesting. The document also contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest a phishing or credential theft campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://oniceh.ru/uplcv?utm_term=moving+contacts+from+android+phone+to+iphone PDF link annotation
    • http://jiin-torng.com/uploadfiles/20210906204404.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/51650627032.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161383a8cd6b13---rorel.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/vububekolonozoxujapotemi.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/vutivebadoriwa.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/tijanosuzapifobaxofuti.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/nubavuvaretedizurib.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/vedavuxo.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/7111230690.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109141047187306.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/85589006878.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/gobaro.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/bulezari.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613882cc26869---botinamadenuxadopikimo.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/93041923634.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/85309956676.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/94b33a4815130eaa12ea8a2e949def48/razovawalavuxanisojas.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/65130510314.pdfIn PDF document text
    • http://dominant.name/userfiles/file/gogumirefuraloxis.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/63231152637.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/remuv.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/64896448125.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/tapobog.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/31477381158.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/93261264233.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_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 11080 bytes
SHA-256: a280524f3f70902cfac009501a8ad0903b2d72c28731aaf05e4a78721b31cf8d
font_02_sfnt_off000110bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BB 17128 bytes
SHA-256: fa6ab496df9d0d5305e6f81b2797250d2d5272d0443ef39d19ac0566634c1cef

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