Malicious PDF — malware analysis report

Static analysis result for SHA-256 aadfdb6a4e1ffa41…

MALICIOUS

PDF

74.5 KB Created: 2021-09-11 10:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e8ac0f32a157acc4840f6052dccae35f SHA-1: 829bb9b6c7988a5a33a60caaf6fe259faaa728df SHA-256: aadfdb6a4e1ffa417a8f20d77436df918ffb198cb14ce481ac5679f847a66e04
156 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm, with many URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to exploit search engine optimization techniques to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/zumutin.pdf In PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/33739602736.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/xumumavinerowelubo.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b09fb5f46ad5de22fcc61fba437b1671/wivewuf.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/36464958365.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1bb8e4d0d---66950923763.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/43086140014.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/genapukob.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/zawatukupoviveso.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/98207401095.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/60224415754.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/60564280843.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///92984359175.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/83785935662.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/q4f7rl1al6jtkpl6i94cpe1ca8/leginurer.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210909141017.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/10fl190pf30mgoasabg2ueeg17/71524237017.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/madokijodagibudumoxokub.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/2396583745.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/9646385210.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lusofizinenanokilo.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/13110442168.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161339f297e517---laxabelife.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/26940414520.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/60551714311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=marketing+management+tn+chhabraPDF 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_off0000bf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF91 10568 bytes
SHA-256: 24d02e485a92084c6f0c113317ad5d28d3fa2afab277b3a7e93899cb47231bc9
font_01_sfnt_off0000d77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 17136 bytes
SHA-256: a2660594c80a935b825866975efc0261e2e1e720bb00f262230058b36e8061be