Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ada0dde5e8da4a…

MALICIOUS

PDF

74.0 KB Created: 2021-10-03 04:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39b187549fc71c543a4694df7bdec6d9 SHA-1: ea5a080aa321aab406e31ba2b80aad7c3dfe032f SHA-256: f6ada0dde5e8da4a26fc4e6d9be1cb33468af668e56b32b0816596dd01b6d8b1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links to external URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload. The presence of JavaScript (T1059.007) and the nature of the links suggest a phishing or malware distribution campaign, consistent with Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://easy-sleep24.de/shop/images/editorfiles/file/nurubaxezikigamuwuxire.pdf In PDF document text
    • http://monthclean.com/uploads/files/202109170225342471.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/62000677943.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e48594a413cb5e6d3a8897a9186bf974/63540668251.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/690fktluo7olvrm6vnha1fb6o0/risajobale.pdfIn PDF document text
    • http://coffee33.ru/archive/file/xofawivilufedanisilefaxu.pdfIn PDF document text
    • http://tdbm.vn/upload/files/vogagizu.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/kajevupakovuvizil.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614958a5a41e1---zuvevosadit.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210927042313.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/72918543258.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/nafumuxiv.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/bizomaro.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28261883898.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20219221429454914.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16155f8ababc56---wujisorijolemasiruruza.pdfIn PDF document text
    • http://entrackintl.com/uploads/rulebozedil.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/mowowu.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/sut2fje9ako4hib4cjoe9ptl00/dibixazesivovogikaduvusa.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/pigadilebojamukelefijasos.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/79963835425.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/nikusesifuzup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=starting+a+sentence+with+hencePDF 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_off0000ba2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2A 10504 bytes
SHA-256: dc68af261d6029b76eb0779c103144898a671cb1e6b2b641dc9a65fc5d6bb69a
font_01_sfnt_off0000d209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 18684 bytes
SHA-256: 77ae39417a84619db4f9ca2e798a17414341645f1f010bef5ca46e2dbf7837ce

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