Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc8e04561ea030c…

MALICIOUS

PDF

91.2 KB Created: 2021-08-01 09:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92976f6b297c4381a45878750f26b23a SHA-1: 60a0d853a2d5632b447de55b75479252251fc398 SHA-256: 9dc8e04561ea030ceed9c37a234dad0c6bc64aaef7d67c056ae361e541ae4692
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f77b721915cb973a0b8e37a6364ba221/11059333185.pdf In PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/84380966985.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/88336193815.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/dk93t7m443tahtp45tc3iofltm/maraxugoxanab.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2b372e06661305eacbb32bd33df93dd/25167014453.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/sl82f8r4u0bh0u1i97jk54edj6/lutuvux.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b8031d216---22330169152.pdfIn PDF document text
    • http://geose.ru/userfiles/file/romakelirewefowev.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/85804490926.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/1d34n18iekhgb3oud7odag43pg/viwexanulomarezafodetef.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/88264623119.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/3ecf9d504cd1ce0ada8b2b3feead45ec/difunubonizumixofamatexu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/hgj97avesei0obt5jopgc2d811/70814028401.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b402079b7a---21460669163.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608534980b691---wodarejoj.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/93304861495.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/38178834581.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/sebaz.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/fodorogegutozuxuti.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/90062335348.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/21742326765.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/xudimadesufuwizopizog.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/de06febf22be723f1d9cfa846cdbf5bd/86967966627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ark+survival+ragnarok+artifacts+locationsPDF 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_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 10616 bytes
SHA-256: 159997f3c970f14998d965963850932556cc7e4c41e9877911ddb5ab561b73e6
font_01_sfnt_off00011730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 18600 bytes
SHA-256: cf811a39e76d01c1612d0176904489c22a02422bffa12fff5c0eaaf2887fb3e3
font_02_sfnt_off000146ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1