Malicious PDF — malware analysis report

Static analysis result for SHA-256 95740ffd960d12ba…

MALICIOUS

PDF

69.5 KB Created: 2021-09-13 19:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca997d7abed391b879cb47ba9c4e8b20 SHA-1: 74d2e69f285aeb3e10bfa59469a803e2cb61362e SHA-256: 95740ffd960d12bacd299a5f42c653d667f41c0973ff5e720eedd07ed53d4fb0
176 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a click-outward action, designed to redirect users to external URLs. These URLs are hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://robertfeinberglaw.com/images/edit_images/file/70886204399.pdf In PDF document text
    • http://rallyteamwalraven.nl/file/96532647878.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/80481480738.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349739a3853---wesumivuwugimedemalepe.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfd443004c---zawubuluxeme.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efbe51b137---16547234345.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/5210451070.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/84446788937.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/62685129558.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/gutamovutu.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/mivonizopu.pdfIn PDF document text
    • http://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/rubuxezobewasifoxope.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202198202923464.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/12143632604.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/14185687344.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/95942876582.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/durudatovatibotaxaga.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/lawitolu.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/buluxizaxuzuk.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/79126737557.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/30953637996.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210906154711.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/sapumizifaloz.pdfIn PDF document text
    • http://toroisg.com/public/images/files/badogulawuposumunudoju.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/kisel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+long+can+chicken+sit+out+rawPDF 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_off0000b4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0E 10780 bytes
SHA-256: 71c08a21eac2d1155b753ca718adea37912e76a4d04df307c1a7169ad92aa75c
font_02_sfnt_off0000e5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E0 13904 bytes
SHA-256: e8e1b140e10f2a74a417dc8a3c7371d627360ff0cd2ba8afd7bdad5d7df439ec