Malicious PDF — malware analysis report

Static analysis result for SHA-256 747fb41f6ee77e1f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 21:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3fcccfcb188cc26b6d5ff9c0f26f781 SHA-1: 14bfefe524bc665887d82a0a23b9af3e006ab445 SHA-256: 747fb41f6ee77e1fe3722bcdf387f8d82933c2ac0cf127cd0ab61811d9bc173c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, likely to host malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3c3755f3---54370229869.pdf In PDF document text
    • https://hotelindigha.com/FCKeditor/file/42134747122.pdfIn PDF document text
    • https://dietacud.eu/upload/file/texesemomikimotapevazevuz.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1317b0abf2---52192949412.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/0cf505ba1ce1d635d8b6723c72610912/44826015922.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a5be65803e830bc9729dd3d7143dcf85/95784265727.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/77509427122.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/jraj05bjqmh9omsh8n50vq6ps2/wuzezobov.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/xudobesokab.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/48072620389.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c0ee1fe4---38398426270.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/2663564523.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087528febb85---zogakiwojuxozekinebu.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/vevaxawe.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d7c895f34---zetifevomanijosavuvejam.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/juraki.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/314ehd5bp5rojhef16eu0oc3a5/saremubitun.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/85747920835.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210716_37569426A21493B3.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/35193342658.pdfIn PDF document text
    • http://idroter.org/userfiles/files/25616037286.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/73675280969.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/v6c82ke2c3oql8me8er71kitsl/nisilezaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cambridge+english+empower+c1+teacher%27s+book+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_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 18448 bytes
SHA-256: 816d5bdfc639605ddb542938c7bde2c9d77a2017d3aa0584703c2ab28d77e39a
font_01_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D38 11504 bytes
SHA-256: 5b6c3fb9b83f986598d2bf697281b2850cba23fa75d7f4a66a65b0ea8d704b8c