Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bffc93eade6bb5…

MALICIOUS

PDF

90.5 KB Created: 2021-07-02 13:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 89095658a6f623b813fd234d96a37858 SHA-1: 0379353714aa985c022109577f9811acf4cc6e34 SHA-256: b9bffc93eade6bb536ef4f5a1619fca1a2bceade2a7002fd85c6dc7c176a4427
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware delivery. The embedded URLs suggest a tactic of using compromised websites to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bandotrading.com/uploads/file/zedikokikigew.pdf In PDF document text
    • http://edumedcare.pl/upload/files/22983905358.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fcc0b9403---10882851628.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcf2312e9a---84784789416.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ec92a1a06733f227ce94f9fe67eb8933/39616063030.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/tojotobafir.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/d5fa2e138310395a560e09f8a8ef4963/wukurepesimiluxavofujipin.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/goros.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rs02asmk07sldmt4ma7505i60b/61010979714.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a982847affb---nidarew.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/16946044316.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706bd54b78f---647409343.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3fb7d3485ab780fe79dba5eba209e0fa/noxamuxuselovufura.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c33033c77---widalisugezipelunaj.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e6546ffd---84153641263.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa81e5986---fagurasa.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/46dcc5da47bfbbbf167566c8824aa502/89034702327.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3a54c161---76696721566.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/322223a0e152748217f913d89e2c4fec/kinajejunelo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fada8227b---59730802193.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/7a3er40h2sn2725nd47l6b6kj5/jevaxavodowero.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/83719d69c8c658865d40adaa1ee59649/jisinofaponusaxaf.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/lsmifoj5iuvn3rapbdfesaqbd5/65692896137.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/25240044e257fe3c70fc499754444fee/31059515445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=sales+management+mcqs+with+answersPDF 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_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 16604 bytes
SHA-256: 2c00872a1180014374020ed8cca5f99820e26909008eea03d60ef52be17e69ef
font_01_sfnt_off00012c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 10864 bytes
SHA-256: f8c2868ff507f2ef6d85a82e50409a639724073f9c4f31955338c1a1961d7597
font_02_sfnt_off00014499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1