Malicious PDF — malware analysis report

Static analysis result for SHA-256 c341e496fc700ce9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 06:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5c572b4967a0f6fb6d783dc80a30b23 SHA-1: c2b72ba5f1d489c15dfdfd331512d24d0f0566a6 SHA-256: c341e496fc700ce983e568fe3bb3eadafa72a5d86da78c08d59bdacef95cd97c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The embedded URLs, while numerous, do not contain exploitable content themselves but serve as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://melz-feu.ru/upload/13173149963.pdf In PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/bilew.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/33472023916.pdfIn PDF document text
    • http://cke.hk/userfiles/wapekovajaj.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a43634a3f6---jorikunelaxudibofurimifu.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/tebbmbic6bhcomtseroa3ta8k3/50188270538.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/f76um768tsbl0qfiun2tclau22/12612719225.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa951263b3---roxivalotowowusizonu.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/62884686975.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/3773137979.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609647e149438---95107103422.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6c0e97983---nuguvixolefikonojajireged.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/1u6i71k4fu0nprp8n4rltas4pn/4884295570.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/lf64qus1imghma3fjmo6avrtn3/29767840496.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b91dec56ab---somudugisomasar.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/wasapaximi.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/49531450489.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/zavilimodonutifukitusine.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/dolesaseboporulivobipiz.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/71715530298.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24150854034.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/lupigozawujorojoxalifomut.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/maparukevitanotegadesubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=roald+dahl+fantastic+mr+fox+worksheetsPDF 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_off0000db25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 18268 bytes
SHA-256: ae20870412aadee87cf227a637b25e57f5d4f85d4112b2662d8dd5534675ef5e
font_02_sfnt_off0001225a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225A 11068 bytes
SHA-256: 0343ef8444a8869877670aaf84d9ed7e9fe8fcb09b966ff498b7588934f99aba

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