Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11f7e4eb77cba05…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 16:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 573e5e29acae2b7d2d4dba0b218ce9ba SHA-1: 89b1ca702d566c5cf1ddbec0fcc352a073a59748 SHA-256: c11f7e4eb77cba05bd4b7428e2429605eb60264aff44da451a2c7d0e5df1e2da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://kingkady.com/uploadfile/files/60550664055.pdf In PDF document text
    • http://abwlargo.com/uploads/files/naxofebulenijujejubejaja.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d0fe46020---23402341175.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/64019326425.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/32813789486.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210909004416.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/92184014468.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ad2dddab7df3cfcc9a4ddced8d10f1cb/40000382899.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/30006837433.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1367_20210916091223.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/lotixosutofoluwu.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/95681300397.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/70225287093.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/lokafabaxomo.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/85208765343.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/77995026818.pdfIn PDF document text
    • https://mackbeks.com/files/file/84020516878.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/c5b1s600qk0liftcke1tfr2ts4/67409960454.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca87d48f0b---pomageju.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/kewibagoxosunomin.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163063182666.pdfIn PDF document text
    • https://tch.lu/files/files/roparikane.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/2217221142.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210907032043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=apps+similar+to+popcorn+time+for+androidPDF 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_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 10760 bytes
SHA-256: d473f096c522f586abaf536522d9888636cf6b3981728c8dea725d94c89bff2d
font_01_sfnt_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 18168 bytes
SHA-256: 72c2da0fc79c162906258d24262aff19e5e6de19c45dd42113569f7fd217ead5
font_02_sfnt_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1