Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7ff90df40344c2…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 17:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0cb69134f9e3b3c94a276d4a69e85ba3 SHA-1: 13cf192fb5c25d4a187eec0f33dfb28f96c92f2d SHA-256: 8a7ff90df40344c26dc5ad4a012802235b66cb7c71b961b3efbcfada4f04d71d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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.
  • 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://ivanamihic.com//files/34719590112.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/duxeguburudalo.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/42624747273.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608b99ace0e27---sagositi.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/35220617935.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/pijona.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/zepazujixidajetoralujez.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c260e9801---96441524760.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/45439522902.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895c08bcd1a---sokikuraz.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/48efafb1536d086987cb3408a953c82f/79356712834.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608691e855404---fopuditirizebinizuj.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fee56edf288f8561063fcdfb3c232c39/77317012933.pdfIn PDF document text
    • https://kultmotor.hu/images/files/2101616193.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/66508277788.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/rasekesoraxumeluronefexu.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f729a263748---21458826638.pdfIn PDF document text
    • http://adice-area.com/pictures/files/63708558850.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/103985ffdb49627ea9fbb07f6732bdfe/7311539349.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/49575229877.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/5090525034.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/nabaditixigupoxelawizumef.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085773325dc0---rebodevukiwozeb.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bb5f95f9a---6239183266.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa7c9ab1fce---64673666571.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/18769993446131783b778eb.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/12168006857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=importance+of+research+to+national+development+pdfPDF link annotation
    • https://doi.org/10.37591/njbrm.vi0.637In PDF document text
    • 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_off0000c501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 17376 bytes
SHA-256: b5d2760a6a5d2e35d1deb36a7989a1928ff0c54792ce81a01936027902d9bb5e
font_02_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 10900 bytes
SHA-256: a23dfc22dea27a30611bcd727eb76b2666e58c8e83d4c0a4516d80232888e457