Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6740ac058f3162d…

MALICIOUS

PDF

71.1 KB Created: 2021-10-04 09:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 980ba9c3cabb6a817ded1838d73a484e SHA-1: cdd3ebdbf52cd4c75bfedb86a1d6d18300372004 SHA-256: c6740ac058f3162d05b1be6d2d4a61cdfdb07b36c9832294ba4d7c91c6c29c59
156 Risk Score

Malware Insights

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

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 a phishing or malware distribution scheme. The embedded URLs, such as http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16140eba834443---39965636301.pdf, are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://blankheich.de/images/uploads/file/vafawono.pdf In PDF document text
    • https://kuepancong.com/contents/files/8036625406.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/pures.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/rolebawo.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/welazawejojakokigu.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/waxetopugofep.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad5c2590c5---jomulemogikekik.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a1ecf07fbd---ziwolusuraso.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/wimupamipubadu.pdfIn PDF document text
    • https://aksusu.com/upload/files/zeligobopus.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/nibamobexawejitivibozosek.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c96185ee---34843267040.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/xizukesinokanuwuzumogo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16140eba834443---39965636301.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/rijexopifubirunuzudatida.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/wibewirenanetotala.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/90081850722.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/mutojudezid.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/88650370567.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/gevukagarude.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/66240377996.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/zineruwukutupinil.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/rojenukabexofebab.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/jofarutigivolit.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/61978565082.pdfIn PDF document text
    • http://skupka54.ru/upload/m/nadexite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=aiag+measurement+systems+analysis+manualPDF 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_off0000b240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB240 17168 bytes
SHA-256: 7f2f6096c816123bc94b6c06f8f3658b4a1985925560e5f6cf48a99b86121538
font_01_sfnt_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 10524 bytes
SHA-256: 7db25df4000a93f4e943cacde8ae5e196987011a80f40854302eda6ecc40285d
font_02_sfnt_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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