Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b4ee8b415420ca…

MALICIOUS

PDF

73.2 KB Created: 2021-07-13 21:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 886838ba0014e4d24d6b3a1ddc5fd7dd SHA-1: eb4c0d8a13bf67d629a844234111b1dcc9ebb5a9 SHA-256: 76b4ee8b415420ca5a48daa8c248dfdc769c57e0d2c755161da394cfd90e283e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple distinct hosts, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b46c039fb94---mokives.pdf In PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20c63c04ec---vepanawerutazuxanobele.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/83467813054.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/gojafukelizabawigu.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/73503492647.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160acd70428b75---83282856077.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5f1b2e265---lavivuwovofe.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4fe34c8c661112db7a7ee59fe92ab7d/bulol.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/5936883550.pdfIn PDF document text
    • http://protok.pro/upload/files/61150715014.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/81870840209.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/99903367772.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc1a864eea.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079eac46cee7---voduxusimilivinolotebek.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885408c476b---xerutuzufik.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57d5646aba---75742667415.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/cgqbr11pauhb5kkjgmvd541rs1/29407119951.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/68120360511.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/nejubegir.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021052403431316.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/12114075186.pdfIn PDF document text
    • https://led7.ru/file/88855991338.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3fa871c49---92347281808.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4ffe01720---dojifadalikikilobok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=bureaucracy+in+south+african+public+sectorPDF 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_off0000ba29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA29 10984 bytes
SHA-256: 9ca0d30a176c146f694d942ccd8da9df1e71fe45c3c4bc510c66e1b210a4868c
font_01_sfnt_off0000d371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 17176 bytes
SHA-256: 24794f913cfb6d76d529761fe83c3f3eff5f6120e88a59d3ba528c2e8777806a

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