Malicious PDF — malware analysis report

Static analysis result for SHA-256 24818d28693f4cf5…

MALICIOUS

PDF

71.7 KB Created: 2021-09-27 07:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2e6f62dfb04d593dc5214ae44ab868ec SHA-1: 2f857ec6d7cedaa97bce9c79335907423b8bc9d1 SHA-256: 24818d28693f4cf5eec58b3ed861bbee085ac865b284e7af0879fc9742c098cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable domains and compromised WordPress uploads, indicative of a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=how+to+take+long+screenshot+in+redmi+note+9+pro+max PDF link annotation
    • https://jobtiara.com/files/files/49910047346.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/nuxigojofazizaxo.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/84111090114.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/gifefisuritoretej.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/21778155020.pdfIn PDF document text
    • https://birudongker.com/contents/files/pusiruxazujevusux.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/28821960199.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/sulilifudoxifosijuw.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/gujodezeboxagij.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/11881602665.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/97423312001.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210922_FF05D01211C578D6.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16150a5c9a5016---39372333452.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/90265930505.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/tarakigevilasex.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/mewirovozifuwugoxido.pdfIn PDF document text
    • http://platcometals.com/images/file/siwelonivipaxinutitobitud.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ace07df2e---pudefewamajiloduwan.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f55b9bb92288e78c449148f14f7cc068/7521437649.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/32f11950f063234fd1ff165d17722833/45128866584.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/gubefonag.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/retelon.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/64844611984.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/wazetawemasiwigijixozukow.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/banedonoraxexora.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_off0000b4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DB 16172 bytes
SHA-256: 267337b21860d683408d0c1c088edc46940310c093a3f27ae4c40355ffe2c96b
font_01_sfnt_off0000ddc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 11400 bytes
SHA-256: 365e599cbeb115e45365c3be45647f683f324424e619affc60bbda4d87f27cd6
font_02_sfnt_off0000f859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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