Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0f551fdf5ebd21…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 09:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a4e81cab5eecd9f0995d437e095b879f SHA-1: 6f427c464e18261d90e96b63fb7d0d7fe21bd0d0 SHA-256: 9d0f551fdf5ebd21223702c89e2931e8ccd7c90009ccf8f17aa8e4f64a52f1c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, aiming to trick users into clicking embedded URLs like https://irlanc.ru/uplcv?utm_term=mx+player+in+firestick.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=mx+player+in+firestick PDF link annotation
    • http://bebsulmare.com/userfiles/files/pofuxitemaka.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613611424f966---pawifekokiwu.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/kogonunov.pdfIn PDF document text
    • http://sql110.com/pic/fevejurudalajopamaluvabi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8a0a932eb---14193609318.pdfIn PDF document text
    • http://boki.hu/editor_up/17275914154.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/sulimexezogatuz.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/98659339525.pdfIn PDF document text
    • https://carlojans.com/cms/file/48292861789.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/biletasuvarunuzagumotu.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/dutadikoxidasi.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/degebanimobarusulupimu.pdfIn PDF document text
    • https://nomortiga.com/contents/files/49848378555.pdfIn PDF document text
    • http://ladna.pl/user_images/file/54918220047.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/51090601378.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/pegejizusugadexulitisuj.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/94524622680.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/98499317661.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdd4b124a---rewamise.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/verogesal.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090806534373499.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/32199863848.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/62111902388.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_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 18148 bytes
SHA-256: 62c8cf4ef7a2680e7e5ec4827d5a1565d12b9840a59fcdde9cbfe869d6740379
font_02_sfnt_off0001271f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271F 10652 bytes
SHA-256: 8ae3a2ba08f8c41d0917ea535620fe7f39b3b96840e92b2fda7d3a5911b700cb

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