Malicious PDF — malware analysis report

Static analysis result for SHA-256 71da074cddd06d31…

MALICIOUS

PDF

90.7 KB Created: 2021-07-13 21:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 84e86e19f58d1a29be9e73b55822b8bb SHA-1: ae0de8e0d513fe2fb494b6bd69f84b7f1b0b8d87 SHA-256: 71da074cddd06d313e0db54eebbf753a8aad4718b82587ee21905a83311ae2ba
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of numerous links to potentially compromised sites strongly indicates a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b831ad957d---54227024011.pdf In PDF document text
    • http://brukbet.com/user_images/file/10549166479.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/62261459273.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077510762f07---15966445506.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5510a9d51---pipiputanogegifezebis.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8fa9ae8a---gemunipegejeru.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080372c5d253---junevewen.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/89400346263.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/jepapilifufif.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/pedolid.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/72133490721.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79989e6042---6382304346.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/2gdpbg3s411bbmi11hb6r2lju5/jigidovinorinosij.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084645245724---vevuzip.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9fa88cd34---banutazajaxumasome.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6dfc8bf2a44f908920ccfa1717d51574/gufotogi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2a9db69aabc7d52f4d98127385707ac1/93104771038.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/riwejobigowokuvurifawem.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef3d8d1cb2---37898814694.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/wevipadilobilevumo.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16089e69821c81---59150888795.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4c5da8870389edde595f02e99e407d78/10791584012.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/fezebazafofinap.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160943363c0b4a---girerorod.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/xomikarapimefivekuxum.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/pabiwol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=c%2B%2B+char+to+bytePDF 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_off0000fddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F2 10204 bytes
SHA-256: 2bbe3d0f2f15c2efe4737a10d9cb4fedfa42b2e7871b45aba6fb14b904d1b159
font_02_sfnt_off00012d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D01 18224 bytes
SHA-256: b47295e974f7a028f94dd7b21de8e0800fa906bced8f246c3d095d2abdbd1c96

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