Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba509108d8aeb9b8…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 23:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ffd7b77d15f7e08ccef118bd51afeb1c SHA-1: 287863e795d759aa1a5caff4cf5a126746f906d6 SHA-256: ba509108d8aeb9b877ce6d1aa3c9f308af4f8ed02e2d6d1ff2f12b11b0847788
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=form+12ba+download+pdf PDF link annotation
    • https://medicentrumnz.eu/medicentrum/files/file/7913527875.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/141860e45600e32ff3d2517ef142f5de/nevinitifuzewuv.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/49503771079.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ba85b1ab00c6ed12da255acaccf2adad/99165498551.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d9b7836f7---pifakewenutitebe.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/89092895157.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/12689473494.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/664291674.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/a8207833ecee3c46463cf4091abd9655/virijupijetaxupub.pdfIn PDF document text
    • http://kme-kme.cz/files/file/67464407246.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/94355326739.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/90389925943.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/dabifawa.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b368e935e23---worezafob.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16246454984699.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/pafepenugurufojesegubetu.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/jizugijegokirepunefib.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/df849a974004cdadc6c3725d10b9d0b2/79258899632.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ba841a6e---15693541207.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/wibamipufejawoni.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/sezeviropoganukox.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/rro0pbkqtq3pp6naiq6vlu05i4/94551516268.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/tamagozupesibalemuz.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_off0000d2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FC 17412 bytes
SHA-256: 71838c6d7243d3c500e4ef2986256a28ed4b2c326a856f5b118f2d906586ad03
font_01_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 10544 bytes
SHA-256: e9f932f253312b68ca32fcc2ecf10798645b4aeeea7e67364867b92b70ea83c2
font_02_sfnt_off000118c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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