Malicious PDF — malware analysis report

Static analysis result for SHA-256 42040bc2bd86691a…

MALICIOUS

PDF

92.0 KB Created: 2021-08-13 18:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fe4f83b84a1d018d9db1427c568368d SHA-1: cf5ddcf5934f34792c4e6a274e8453f3dbd2c0df SHA-256: 42040bc2bd86691a2d0abb9b70fd7cf22f42ac6e98562142d941080fec9ea74b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://magyar-logyogyasz.hu/fileok/file/34318882385.pdf In PDF document text
    • http://ekstelekom.com/userfiles/file/36188329460.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161007ac0ac09c---jabanatusonawi.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/18225378295.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/tenoxolexalikuravo.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/47806639566.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b0a2d45018020949f650cd5948bf0d2c/kaliwokugewopop.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/878b38cb179a827a2a1062de089764f1/kefedoluwutojotopu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78906975a1---pebofovotenojivapis.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210715184528.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/7d9764ad5d746b20602bb600e2f58bdf/tufusezawiw.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/zafubug.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/6042eb730cc6df68a5927f57c39e8356/lipobotijojakufowexujumag.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8hh27q7fjd4cphfn1tu11qajuv/xuxumezowuzefuvarolaxitu.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/bigixixon.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085513ee3545---74185620639.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/20722140353.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8064f8db2d---44783692261.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/zugowelebusi.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/39258400024.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8031d649---46078489771.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/d95c5533dd2b4408e886066541c34eb6/kubebizuwusoroputus.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/wapirawazepalugoxo.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/74487545775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+crystal+party+randomizer+downloadPDF 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_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A16 17612 bytes
SHA-256: 81706b023c6de7bab5e43f7f689978e72477cb1e6d2af43b6eff86b85833d842
font_02_sfnt_off000147d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D5 11028 bytes
SHA-256: 02e17766ebf0473f11a00eccdb162c2c6f05b338d16641c39023cad978e47818