Malicious PDF — malware analysis report

Static analysis result for SHA-256 db50e013e988cb81…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 03:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 400e8daf78548267e913b01c84937f6f SHA-1: 4e82ebc06f41584367b5b195e2492b18d67b00e7 SHA-256: db50e013e988cb818abd08fb4d318141060eb34c221251715ad0c2843b2e7b89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript points towards potential exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://koovappadyscb.com/ckfinder/userfiles/files/kusikikoluka.pdf In PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/kafikofur.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda47a7552---76716138524.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106152300556861.pdfIn PDF document text
    • http://araonline.hu/uploads/file/vuxukopafozed.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/15134763199.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/robubujij.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/16673309005.pdfIn PDF document text
    • http://momsystem.ru/public/file/69514669030.pdfIn PDF document text
    • http://mobiliteit.nu/files/xojokejibakulo.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/14755589262.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/ulo568s5judol9gajm6dtqis30/fisav.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/10419723043.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/govasizalofemug.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/j7ms5ga7qregv439qsgfflant3/sipod.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/0n73pc4a1k84vbjfc5u86csoj8/dugasilivozovotuxal.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/gomugokam.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/bonusafeseda.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/volukumegafifasutasolume.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b8c3078925---vimimomolovatibet.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/87117935537.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/nesakivano.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219da41ffe0---zogejubirabit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=reading+inference+worksheets+ks2PDF 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_off0000dc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC27 11052 bytes
SHA-256: 2b2c9d4f18b67ecc1c94ed51bcf5c919d1a97a2932e53b51d6650355ae00e6f9
font_01_sfnt_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD7 17556 bytes
SHA-256: 7cd67cf589e5b37ed02be1ee8cf728c21f415ea557d06555cbac4cd83c7eea90

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