Malicious PDF — malware analysis report

Static analysis result for SHA-256 985be7713fa103c3…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 22:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9e489c2cb92ab9c36c298203d321959 SHA-1: ae8e442e109cdf973f0c59058017b7dcb15c9582 SHA-256: 985be7713fa103c31308a511cfb39007ea9a7050b33b4d250ed30aa3bb890a4e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://crysiq.ru/uplcv?utm_term=filum+protozoa+pdf PDF link annotation
    • http://cartopack.be/Images/file/89104592497.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9af645152---20861858145.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/81125374139.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/72280248896.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/xebewema.pdfIn PDF document text
    • https://riwg.in/userfiles/file/15158822912.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/tijefudulifanemukariti.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/md88r1nbe5hec5taml1sclfg23/fijewiwakin.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/voruwojeribadigo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085219740fd2---wosolemosazoz.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210815214547.pdfIn PDF document text
    • https://plasy.com/uploads/file/ligivamezijusamuko.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/tofakasuduxum.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/13988960770.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e92ed2b484---9427113556.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/lelibujikog.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/letibigi.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/3637736714.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/93790222368.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/87988852252.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/19714636259.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc83dc7340---gapabadowedafepoma.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/6ce427f150f87c6eec87937f700fd3f9/91958976418.pdfIn PDF document text
    • https://loyd.rs/images/file/9330122091.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lazawemefewajoribefuxikaz.pdfIn PDF document text
    • http://dbpedia.orgIn 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_off0000ead1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 16932 bytes
SHA-256: fd09dc5596be891de9be6a159cadf298d1bec69998c172fecf0868b8129353e1
font_01_sfnt_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 10392 bytes
SHA-256: fb83a1ab91ae7fb75a7aa8cb66e5daa291c1b48ed1e2fc9ad72bc55402414799
font_02_sfnt_off00012e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1