Malicious PDF — malware analysis report

Static analysis result for SHA-256 df71c411f2e8c2bd…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 02:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 47cc1f3a0956573e07a3d0f1c709987a SHA-1: 6853521d571f69400a8c235c534931523f8b9bc7 SHA-256: df71c411f2e8c2bda6d79b6b562d86f63fd8bc39b676176aec7913720edb72f4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious or phishing websites. Heuristics indicate the PDF is designed as a link farm on disposable hosting and points to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=the+bodyguard+1992+watch+online PDF link annotation
    • http://associatedreclaimed.com/userfiles/files/mumaxidijoz.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/71634721077.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133ebad2e286---28464738686.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210909_052825.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/rimavefonabaparututamo.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/e936abbeb98ce44af86bdd8d522ff3f2/78207962846.pdfIn PDF document text
    • https://ultralloy.net/upload/files/musibuve.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/59935043231.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/7207400290.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/61204978839.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/46119474679.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/32490216753.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/qgpshc3edujjuv8pfp2puo7d48/wekaw.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/66929069694.pdfIn PDF document text
    • https://mkart.it/uploads/file/ditimawikukilewu.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/87076868014.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/fetuxuxex.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/93676384830.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/97306223658.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/bezudojop.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sudeb.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/8053525922.pdfIn PDF document text
    • http://vkts.se/userfiles/file/miwuwu.pdfIn PDF document text
    • 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_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 11224 bytes
SHA-256: 6f593744a7e436e174bea0a92745b1480dd41c7f50c265fda412dfed2186929a
font_01_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 17876 bytes
SHA-256: 65127b439f92818c8ab29d00d1657f85847387b255b9c81fe976b463741f7ce6