Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97118ad916af928…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 17:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a25f81e98215121a88038dbdbcfb6fd5 SHA-1: 78210229f082a1014ab326afa76ab020520f9d2c SHA-256: f97118ad916af9284ceda045d93df86af9a00f519543d640684e1491d5ebb5a8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to external PDF files hosted on various domains, suggesting a link farm designed to redirect users. The presence of a raw IP address in one of the URIs and the ML classifier flagging this PDF as malicious indicate a high likelihood of malicious intent. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://kayapalinakliyat.net/file/kegasesojodop.pdf In PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/wokifidosafapeworof.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/3df6038701eb765d2b2974bf01700ddd/96799912162.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/44251599524.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/o7v20diuk7654st0494tmrds62/20045555320.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/31144414963.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/buvev.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/foperalafogamolegugodem.pdfIn PDF document text
    • http://hzqzg.com/d/files/37821966115.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a357303a3---jesiges.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b6b78375f9a34c8f970d1ce33fd97723/jevexivikilefixof.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/19575417354.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/zajegilolifexekijofu.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/94788475823.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/17639688745.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b4bccc231---38239723243.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/92667194806.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614032d3e2a04---14235747669.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/vevofofafolebujaboz.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/firiw.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142df8003fab---wusijadazatasaporusepa.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tugejagexo.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/95179395528.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/u5q1jhrdk8nnslmuu8860cb4fk/36620221980.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/fajasofew.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409534152e4---zonexapiten.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210916_091953.pdfPDF link annotation
    • https://queensflower.nl/clientfiles/19525603734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=video+not+working+on+androidPDF 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_off0000dc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 17100 bytes
SHA-256: dbe1d2686a443ce72980bf59fb8f83d6238ce9c1863be1d2c4534a3ce4448bb2
font_02_sfnt_off00011fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 10356 bytes
SHA-256: 3d6dfc587defa753ee5058c256521139063c00cb32c1e093e3c08bd391ee7a4a