Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aef87ed908e0f4a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 03:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 24c7356da085bb5e50a4092d75811e02 SHA-1: 19bcfd83f5f8dd0fd2623ef20871ebe6cce4423a SHA-256: 8aef87ed908e0f4a1490d0d2609a4337b536754433052aa35e2d5703b48a7f10
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, with several heuristics indicating it's a link farm on disposable hosting and potentially compromised CMS uploads. ClamAV detection and ML classification strongly suggest this PDF is a phishing trojan, likely intended to lure users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lokalizacja-gps.pl/userfiles/file/85438637969.pdf In PDF document text
    • http://kozelskadm.ru/files/uploads/files/25548253267.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/tidemugokenujapebavi.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/tududaxejowu.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/mavejo.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130765cb52a9---71485219943.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f239d6b65d08276d75fc1fc07082d5dc/53187675603.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/sirepux.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/74701752173.pdfIn PDF document text
    • http://jonme.net/ckupload/files/mamukoxe.pdfIn PDF document text
    • https://plasy.com/uploads/file/22409439906.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/rugalagudotikuxadokotux.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/lapoxutolok.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/wunodubusenifegi.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/31307121537.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/72763276728.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/beridis.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/zojuj.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139db14840cf---34240222231.pdfIn PDF document text
    • https://businesslife.com/content/files/74710775023.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/pawafamititagagisepu.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/xalesozusuvodakulidek.pdfIn PDF document text
    • https://produse-zilan.ro/files/puwizerenuwek.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/soxukopapep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=one+piece+free+online+moviePDF 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_off0000d872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD872 17188 bytes
SHA-256: f2e6f358841765b4d99696ffe50e8a8aaf44c3b0d1be53276a0c87647f9a1fc8
font_01_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6D 10304 bytes
SHA-256: 7ac21e3d83ab154b03929e978d75e910afc9b75951de80e30f3a7f0eabb453e8