Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3cb02fcfa93ae99…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 20:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 64cdefc4f7b445c8011d1775952c8211 SHA-1: 682df5367b3ecdc3039355b032b561f1bcf358ab SHA-256: d3cb02fcfa93ae998b3eb73156a649822d768c0a95ef14f9d2316a65e461446a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=auto+read+otp+in+android PDF link annotation
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613459f1b7ed6---lilolemov.pdfIn PDF document text
    • http://etkenkalip.com/files/jasidalumokesesariwujunu.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/37438572398.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/27730399793.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/gejozetazemutovovu.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/xeguxofururumizesozezugup.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/dekerudufixosofi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d3211f5b9---62651934216.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/vevuti.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/14825855480.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/berobumawelopizefexikepe.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40073024039.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/wiwoxedonevufav.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/76745736924.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/686e3ed3464a15d8c51213e7d236c14f/tobadosoromazipusetovoxe.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/poladenadiwatajo.pdfIn PDF document text
    • https://oasis-travel.ro/files/xiwumuxudu.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/ziwojiwusujewibapikopup.pdfIn PDF document text
    • http://sayarbobinaj.com/file/53636594687.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/lazila.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d3da3e591---66796431231.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303ef1da76d---912307188.pdfIn PDF document text
    • http://santehnika34.ru/images/file/xibufapesol.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614195ea8c807---97999664251.pdfIn PDF document text
    • http://neteyes.eu/editor_up/biwez.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/bopiwugolenug.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_off0000d5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 18788 bytes
SHA-256: aef95ec0195c4d45e24e45d5bc39f384e6b5bb73ee0f8b9517abc159b989d3db
font_02_sfnt_off00011ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF6 10252 bytes
SHA-256: 665bd1044edc7965cbde9ab7eec2de06c4ed7b7174d986001de9e56b7801ffcc

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