Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5882e6bb9eb202…

MALICIOUS

PDF

94.9 KB Created: 2021-09-04 13:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9579dbce07369532356a60b6f22ad5cd SHA-1: a71bc3bbd6c6f0c882645094b0d5193cf6e7968c SHA-256: 8f5882e6bb9eb202af986601815f250afde92da6b76a1d1cd5d48cb3eb0c2111
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/08367f1bf54ff255b912af7a9645f764/58243996358.pdf In PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/54510227989.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/35968501389.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/gokuz.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/bowap.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/kuxufivilediwutozeki.pdfIn PDF document text
    • https://gameclub.by/uploads/files/39305163073.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/cge136vrm2m2gp1aso8kc3qihe/gigejik.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d6520d389---nosaxizoregoluredogisito.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba49f68bd9c---85661162878.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/73416581434.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7lubmlnc2gfigj0a56mg9htpv0/nodilatilidu.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/32864221960.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/lusidabogajijulosujedirez.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/nuxolelasuvot.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073318eb3c34---76121469424.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/89907008474.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f9bfad009---92257870699.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mezalimumuzikasodureved.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/muzerexol.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72dc0b73a6---35390678876.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9755fc7e56b8bec226da0e7fb5639380/dabokonojobovurapatagum.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/55d573786fa1fb79a5bdca08834b04a1/749849337.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/68231878528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bcom+departmental+accounts+questions+and+answers+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_off000109fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FD 18720 bytes
SHA-256: 82fbc7027228b565a77b7c4aae6c471cfb5bc69592fb43170160e8e4ac8f3b4a
font_01_sfnt_off00013b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0C 11168 bytes
SHA-256: bece2a3ea29a05bd4caec2029e75509e3d8fd80020d3b5fb03b941ae03eb0839
font_02_sfnt_off000154ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1