Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ab889d409bcd0b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 11:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6304104502af834579b6d452296953da SHA-1: fd8fba688386bfb4348c99c0e5264c61cb2bc050 SHA-256: e8ab889d409bcd0b958215bc8a68328f57363e0935a2d5e94273e289ec6815dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://thinkglobalcompliance.com/ckfinder/userfiles/files/matuzeva.pdf In PDF document text
    • http://cukiernia.eu/upload/files/50576774961.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/92296970466.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/zozitorewuworabar.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/679fd3728341ef0dd1dea24e9e92952c/10480449778.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6c68fb160cce9ab15647ad53ae6f31c6/38257165133.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/6378254095.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/bobepir.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/22486770121.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98e21f29c5---26251198365.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/41685840072.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a96632bab56---niwikujodamuludanuwuk.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///dovibatopodupatinij.pdfIn PDF document text
    • http://shophouse.info/images/files/xewezivejuviwa.pdfIn PDF document text
    • http://staropolski.net/Upload/file/52442277073.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/lefaresu.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844f1c78279---vezudum.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087636b2561f---54982923707.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/reximujotamapedobos.pdfIn PDF document text
    • https://landi-bg.com/images/file/5759630391.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/nutejawi.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/92515564711.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/41424765458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=list+of+ethical+principles+pdfPDF 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_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 16560 bytes
SHA-256: f25571e85e30bbc65c1f952acdae8e881589f053b1659e1e142a8b123c7b94bc
font_02_sfnt_off00012628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 10672 bytes
SHA-256: d8cf68474927ea5c2e6033957704b9492f539955f3957c9cf974e71e0d36f4de

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