Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d5324acafff21f…

MALICIOUS

PDF

87.0 KB Created: 2021-07-22 23:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 133ff543a460b772d44e4bbe6ea08671 SHA-1: 65baaf4af9adb7f3c55c3bc3536deb04ca0b7865 SHA-256: e6d5324acafff21f3caf51ba344888e82a339cc540b6dbd994268af23deea047
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or further phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zlato-stribro-investice.com/upload/files/737323392.pdf In PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/jimerotetomisimap.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2325fe7fce---10661566800.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/7523792237.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd0b5be22---81373450669.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c96a438f747---nopixulur.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/25198987763.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160869e2367ad0---51252919446.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f84419274---28176079369.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/6e80790f0aae42a011cceda2a024cf57/zejitetix.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab3a14f5f---jezevezudolozewutegevipum.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16098a44289f91---vuwaxorid.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba68c1821eb---52672547889.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/satedazuz.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/puvunajibalariw.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/xomazibowaviru.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/wotumalinogeritegum.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//69822533879.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/71556400295.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/vdo04t7acq22t8ri12eov2kta2/38505221749.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bebec6073e1---tudugow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=super+junior+knowing+brother+eng+subPDF 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_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 10948 bytes
SHA-256: 2e47835b077bd2d779fd47b20b1d3173c754506a6d538109a7adb9c2384ed6af
font_02_sfnt_off00012039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12039 17488 bytes
SHA-256: d56831e3bdd45068a191edb00875b3082e466e93db26eec795c4bd163cfab057