Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b9836bc501650b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 15:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 302e03c5db1b9e63496815a814b32571 SHA-1: 4204a2edcf3592d50b9c3d944a0ea54c6a458bf3 SHA-256: 17b9836bc501650bdc00f74b840d2e69ac140c9ce8c1c12f2828d0e1f77894a7
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5ffb21c8---51617039195.pdf, are likely intended to deliver further malicious content or lead to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa054767b7---mekoxonozakavuvadi.pdf In PDF document text
    • https://shindah.com/images/ckeditor_img/files/jomemuxuxamolefopelejer.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/pemuduguvoxitebemexewuned.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/feleruk.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/zujemawuxereveto.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/5333369406.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/40432165035.pdfIn PDF document text
    • http://insei.eu/userfiles/files/80410792.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/97884687664.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133701d4ce21---10732563948.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5ffb21c8---51617039195.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/wamuvegejifoviti.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/votunudubo.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202199653308370.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/tuxotogodibiwofej.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/91082951596.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/719251249.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/lafenojefexetefulaziv.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/bizajaxik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=iptv+smarters+player+apkPDF 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_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 10320 bytes
SHA-256: 7950f37159045edb673b68196b2fa5efaaa286736df44f35226a0c4af2805135
font_01_sfnt_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 17876 bytes
SHA-256: 30808cd6cce19aace7dc8d255733416b810b4835d6acc8669fec2beb5daa716f