Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afdaa40e759d4b9…

MALICIOUS

PDF

72.7 KB Created: 2021-07-13 19:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e89a9b99a3da50798fa4344d4adb28dc SHA-1: 210da7b863e4300724dd312151559d9d70117868 SHA-256: 0afdaa40e759d4b97b19b224c87df0916f5f9ce94ea97b8cf0b04ef27add27e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous external URLs, many hosted on compromised CMS uploads. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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 https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3a9a0bea9---31214162448.pdf In PDF document text
    • http://poorclarescork.ie/images/8578277728.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/56rfpu96ir3q7q4sm7v3elc70o/venesubaladux.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc7eaa391---fawixog.pdfIn PDF document text
    • https://csodamalom.hu/files/files/27341579488.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/geroriwipebijorupekiga.pdfIn PDF document text
    • https://susta.vn/userfiles/file/87032104074.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/pazivefotu.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4298e5f8825aa15fc8e05d8aa0cbc26e/jojovafuwabis.pdfIn PDF document text
    • https://jurad.eu/files/file/97992196322.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/kulejusurakalodu.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/27716154093.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tibajikes.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/2448058361.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608302f2d1a36---ralujofikekinufezoroli.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e6d9e6398d48c418f7bf68118f0628ed/38517300440.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/39n7pgslqpnrfkde1itma31imv/57358130860.pdfIn PDF document text
    • http://blatt-gruen.ch/files/gifetetukov.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/76510869658.pdfIn PDF document text
    • http://shosholoza.de/file/sukunebigifivakepefopowo.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bdc4da55d---tavidevaruvid.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094d08736d42---32935762602.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/wurojamagadojuwata.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160857562c460c---duxodonida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=online+java+editor+and+compilerPDF 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_off0000b902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB902 16876 bytes
SHA-256: 3209ca0bd071438bf4a4da8751315e2ecb72f399c32467fe5ebe928aecdf02bf
font_01_sfnt_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 10728 bytes
SHA-256: 552a28e7e5e1d27ab12a7d59bb6ee7b074db5e51d140efc1e811854bcaeb6cea
font_02_sfnt_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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