Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37d37379ba775f1…

MALICIOUS

PDF

97.8 KB Created: 2021-07-03 18:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 993ac9a0b91fd2f865a6f8862536ec40 SHA-1: ffa9d9ef28ada71319a6fd18144c6cea498387d6 SHA-256: b37d37379ba775f1cf9ddedd3fc633b30537ef85855e5d61ddfc1e196687fcca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://agendatourvietnam.com/hinhanh/file/15060763876.pdf In PDF document text
    • http://shipsupply.ru/userfiles/files/33442746391.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/923fbfc2744fc9a1d43696d2bc42c82b/40109240338.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/72684944574.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/daxemizulizesegozow.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/doxidadosubu.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c3ef46ec38540be1cfd32c48cb5d423e/67290832472.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/cf0a6466736302da0432a6ad3476808e/jokezobavumisomiregeji.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2c549f23779914c39f7e979e040e99c3/tetuxelimobetokabobof.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/fab273fafe5d2c8f85ee0faaf02d7cf4/71271236635.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/jame3f1ceappisslao8c61819l/wefonedudelevasimisediboj.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608473075f994---zomolaminakeduvanisi.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/75857380915.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/deb8b7332e581b1dd0eb87df5ace2d26/95636989293.pdfIn PDF document text
    • http://asustainable.com/global/file/xepigemapegepedikol.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/dde3c7bf47039df5547457f88527567e/nenobuvigobuwotobize.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/magewuwazerutezapolajibok.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/modugofov.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/0f9229d1bafdcecc367a764b4203bf0e/49561650305.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/dadadc06e95e35a944f53060598cf98b/210238606.pdfIn PDF document text
    • http://jp-cable.com/d/files/xedarotorusopitifemusek.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/s1vud32gc13fogj0k1n23lhqs6/88284044482.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a56affa2993---70618063662.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da9e571a2f2---73232158075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=largest+tree+in+coloradoPDF 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_off00011c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13413 17616 bytes
SHA-256: f8ce1f7a62381552cc042016c9b867aa76280af8b1124796f7f504b0fb524d8f
font_02_sfnt_off0001625b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1625B 10500 bytes
SHA-256: 46c74c5d13ec9e5e5810234f9fee89b491a77b282f17ade9c6e004435d8a0689

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