Malicious PDF — malware analysis report

Static analysis result for SHA-256 98afcf8d1fec414c…

MALICIOUS

PDF

89.1 KB Created: 2021-07-23 03:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aac8a8ae65527ab5b71bfde3cf82e847 SHA-1: 364d86c28c5071d2d1f793ca4ae9e5e5e785e714 SHA-256: 98afcf8d1fec414cfa29c052f069bfefb9701a82a8358684b51911316af14c2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised CMS upload directories. The presence of a link farm on disposable hosting and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malicious redirection attempt. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090d9c2b6e05---mopavafoxagojusajopug.pdf In PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/12013804837.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/fojazunubugopakomowun.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aca3e3a2a58---gatatewiger.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/d0f6921ucqqoq5edklihlfs11h/bimekojuregekasujewu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160afb3b28c89c---likufuvajelupifos.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/sowez.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/15283632581.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/48ae1a9a32d3c8d36382730360fc49ec/58263399773.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/berada.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/45769761870.pdfIn PDF document text
    • https://soechi.id/userfiles/file/79689537937.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/forewaratas.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a328857ecb7---34514508366.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078234fcfbea---zalufol.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a771844b3---xetilovavesimu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160adc68197b8d---kosolediboke.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070ceedaa35e---89130458289.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5af89aea5a---jizomajovuxu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6dffbfc8d---bigudedotuselodoriw.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e39b88965---73498590213.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/mapunadudajonevixano.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/50653361819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=nevada+state+law+cosmetology+practice+testPDF 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_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 17248 bytes
SHA-256: 455d604092985fed73cbb3985f4c12a5803b7d537d10339ea5f976dcc003c92c
font_02_sfnt_off00013c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C73 10996 bytes
SHA-256: f8bb8e5628812048e2c4a2b741913c4a55ade9cac06bc4ee73bd886340193171

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