Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc1a685f247b5a7…

MALICIOUS

PDF

132.9 KB Created: 2021-09-02 02:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be68859797f93fbec9b13478058e341d SHA-1: 2122f2d5789773b2c2e6ac7b12d07dcfcc542abf SHA-256: 8dc1a685f247b5a7292afdd66885d77ef74dbbf2fcaef13f419f58e8e9c63fe3
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a likely attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kino-cosmik.ru/sadm_files/ruxufuko.pdf In PDF document text
    • https://lengthening-sldf.com/userfiles/file/92004771569.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/73583856331.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/josuwijoro.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076eea871220---74553963511.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a3deeb478---68767576804.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/17217681203.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16090aba39c632---17896289101.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/72977564845.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/g849mm0l5o3gop0g23pdjm2rns/sekokafimaji.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/1612449454.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/iusr7kk6l544cl38cl1c9u207k/bajeb.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160706c9d30313---82897729400.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/besepezemoxetapa.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/29200732442.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160edd784943a5---14167737898.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/86008227334.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/tuwubikovixo.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/tuxozigovuka.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609182c227d56---32304498668.pdfIn PDF document text
    • https://bloomeng.com/uploads/wigubokupitekifasoki.pdfIn PDF document text
    • http://alkanboya.com/files/file///rurasovoputivafizidixixum.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/sajakisowobimoripadetovu.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f08ea01d73---54030047878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ecg+and+exercisePDF 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_off0001a402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001bc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC14 19644 bytes
SHA-256: 2fbf53e9c9b5153256d7d1ce88acfa2f1a0070fabd51fa4ea7e87bb7bb42c754
font_02_sfnt_off0001eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EEDE 10364 bytes
SHA-256: 84223feb875a102bcf5d1fc0889ed003c2ace96f1a7393726ed0f58bec87e3e4

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