Malicious PDF — malware analysis report

Static analysis result for SHA-256 dedae0cab04c2ab8…

MALICIOUS

PDF

102.3 KB Created: 2021-08-10 08:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df7796e909b826b97f5241c8f05dffb0 SHA-1: 031cef1b32a727df843c7f7bc49abc2449d0db7a SHA-256: dedae0cab04c2ab8c31609f46b18ec17d4a901043b80b13dbc7d8ae12227dfe4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious sites. The PDF also contains numerous links to external domains, many of which are hosted on compromised or disposable infrastructure, indicating a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bora.su/ckfinder/userfiles/files/69005507019.pdf In PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/tilotojirodijuxipubudibag.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/dewegul.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/70472237139.pdfIn PDF document text
    • http://wrhsclassof82.com/clients/d/dd/dd94ad2327da436b0bfbe5937c3cc641/File/54745796518.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be12366bdd---barosovemimasevuni.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/cu8iilni4bu31d831homc7ppq2/6997365138.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/426a3aed01748042f506a045e601ac4d/pulurijofogotutirigukil.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/25788050854.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c0e238e84---misem.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/g39494kmbn5t9upjd6bpkotfv1/zuvemevosuvov.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///27284938075.pdfIn PDF document text
    • http://abnicum.com/files/file/sipawelanerufesegot.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/lemiwetizujukesupewaw.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b69fb173391---46199523997.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0300009a5---xitudegupubigepupak.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/59885475037.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/735554252.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1607a67c60e883---zumoxebivujotute.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/45860302722.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/02qkvqbaqpqrsqvfs2q03n8jc4/65705791735.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/lafujimadopizelonorofij.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/widamabilafevobineta.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/70455786698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=plantronics+dect+headset+manualPDF 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_off00012984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12984 10736 bytes
SHA-256: 79dffcb042b705275d180250a1a4e69196aaae8ea46c7b40958efaf3873eb1a4
font_01_sfnt_off000141fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FA 19092 bytes
SHA-256: ecd9d4bd666d47336dc89aecec4afec6198499d2c0a18377ad2e1c246854e46c
font_02_sfnt_off000173e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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