Malicious PDF — malware analysis report

Static analysis result for SHA-256 da201ba4c19912ec…

MALICIOUS

PDF

86.9 KB Created: 2021-07-18 15:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 05752c2a46e6fbcc527707ec8ba3a4b5 SHA-1: a1586f0beafcaa6f4411df803c8facb66ae1f901 SHA-256: da201ba4c19912ec9c2a647ac8f9657d4f697e46ed57f91782115ddd446de415
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/47f5571e40a781189730f5a2de6705f2/83925136393.pdf In PDF document text
    • http://magooferta.pl/uploads/fck/file/48533099235.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a23e54e0a---40037666286.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/qtb6un1cqbo703ubs9v1leusl1/13247057217.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/31395218650.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/95334042511.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609015280fce6---malusexaronogis.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/34241015677.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd511a4f69---kevijarutug.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/63364994304.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/76b0d25217b6f8596ccb53986b85992e/81556478652.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/73977648157.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/fagenag.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1395fe8ef2---pigiwepumetabiki.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/77742432652.pdfIn PDF document text
    • http://deauville.ru/files/file/80983078419.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/ludufujibefel.pdfIn PDF document text
    • http://mav-auto.ru/images/file/pitubatukumetubitexef.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160db1727893d2---55321828262.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/diguladetedanuxozej.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0eeb53f2630429784324892e89091ecc/933606162.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/jalumubet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+1+csr+racing+2PDF 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_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 10424 bytes
SHA-256: d5987064e6a3d7ee996d81800389441d7660b85fde4c6015fa0677073d747be9
font_01_sfnt_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 23748 bytes
SHA-256: 88dd38aa696d9d21488f43a1c2433c0e84ec1effa1980c119430ae680e4edad0
font_02_sfnt_off00013492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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