Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9aed3636f65c681…

MALICIOUS

PDF

97.0 KB Created: 2021-09-01 22:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 692ad0c3e8220a21a2da735deacd0ec7 SHA-1: af459b46a5de37d88928a567a4ec50da4960a032 SHA-256: b9aed3636f65c681e91ec43dc2696567cff4ba06da881acae8a0640eab8dd85f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://synerhu.ru/uplcv?utm_term=guide+to+davinci+resolve+16+video+editing PDF link annotation
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/79623182239.pdfIn PDF document text
    • https://nada70.org/userfiles/file/pogatitutim.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8e6529510---judatom.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/16695433510.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0a5007cae2a5aba6d71713e8ebf3b69/bumaw.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/gojex.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72d3df08c---62981879599.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/wotoderixumeno.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wudag.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf2df2559d---katuvarowozusisowigipem.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa3dd6e41c---53191839990.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8032c0e05---95616106666.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c03aa30e758---90367514250.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/kubon.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/46496265441.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/tadewejapajosofe.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b162f1db92a---xajopena.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6a3a204e9---27623452993.pdfIn PDF document text
    • http://thedreams.cz/files/tusezelowa.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/1ee90177b8a4b3cd979864413221a419/69283189654.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/xazebovirozewini.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/kuvifobuz.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/95810535497.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/6gr01hi3a8umstv9ep7818f7us/kozigevokurexo.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/74321401280.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_off0001129e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129E 10968 bytes
SHA-256: 216c84c080063524a2b17c8a6f5d4d77128faaabc98dfd6a23e69768e5ad1afe
font_01_sfnt_off00012c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C18 18952 bytes
SHA-256: 380c74b335c243c1931c7d46b7942ce12553963babbf33080a314e1bb4da7dbc
font_02_sfnt_off00015dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1