Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbef6fbf575a72ed…

MALICIOUS

PDF

75.0 KB Created: 2021-09-17 20:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a2b80527279d56cb50fef1aa493c0067 SHA-1: 7820f763a721cb1934041c40506118d27a26b4f0 SHA-256: cbef6fbf575a72ed244af3d8fd86391093304435b029890c6bbb1f90f5717dfd
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the execution of further malicious actions or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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 https://crysiq.ru/uplcv?utm_term=speed+test+ookla+pro+apk PDF link annotation
    • https://eminencesolutions.in/resources/userfiles/file/jidekugowonugin.pdfIn PDF document text
    • http://js-space.de/userfiles/file/getokibirejifosuxabedal.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/28987948981.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/sobufozatuloro.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/muvikufejojakit.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/dotazigatifofobepiwawa.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ae232849c56c9b9202fc8b7921b63fe3/dikupulesedewedek.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/9529049500.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130b0cbda30a---kunigunuzen.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/24565201867.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lqknajp1vn9bfucddmo1jgtso5/88377080640.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/vadubezumavumud.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138dbe976635---vefogiwifagododigak.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/kaxotakamawozazatew.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/13179658052.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/58898658743.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/putowo.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/kuborilexan.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/1cdbd775d3ab080b023f1343e80fca90/73057160437.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/lotewuxiveloga.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/wevolodededivipusiwuzive.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/53563249319.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_off0000c1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A8 10356 bytes
SHA-256: 1e34c1798c5619dc2dd3f6d5149a69812e083d9b0186fd8dd1296dadac2d6a69
font_01_sfnt_off0000d931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 17348 bytes
SHA-256: 893504388145788b247a15129288589c5ad4476ba0f420bd9be6eba3845a7550
font_02_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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