Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f51f1b9a2448e9…

MALICIOUS

PDF

93.0 KB Created: 2021-06-29 03:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fb0980a58cb5c9da050e024d9b8e8249 SHA-1: 188020ebb5c4e19c64739fea8a99ec12cb8223cb SHA-256: 17f51f1b9a2448e9cc0b76cd6840f1c29cf900a50bae52ada4bc6a17d6a9f22d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, hosting numerous PDFs on compromised websites, likely for SEO manipulation or to distribute further malicious content. The presence of external URIs and links to compromised CMS upload storage suggests a distribution mechanism for potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8b676eca---7686307318.pdf In PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a936d568c826d7daea151bf65f4cbcde/83893926741.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3259c83b6---88449485408.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5b752dec4d4d5226d1edb8a3bbf7772a/44683053583.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/dge7cddo6iav3d0ipfu09m2fa2/52296213428.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/46610878172.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1683a102e4---14121554614.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607db93ce2ba2---16046526360.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/on4ir53o9c32di4tj4m348h84t/66666265390.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96cb83e24---86774234285.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/3913798961.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/kurasanajolojitenef.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6f61c7dd2---suxum.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1476e527fb---19309994323.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/nc8rnen424qd2ldg996h4pgvum/26238550528.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1820743842608e3160e30e3.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/72217428771.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/1452851530.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609b88f2ac564---somepafagim.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608427b04a9dd---5420206331.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/28683477275.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/4ec218ddc4dabc6df97413f7b85e7aac/fabutununax.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/61858861082.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/pelefufonawigixigofefir.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ff2e27c4c---dufavifamiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=digimon+adventure+psp+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAE 17520 bytes
SHA-256: c86e4d37718536eb9d7dcca441e79b9691995cc028e388666053ce60a99b944a
font_01_sfnt_off0001295d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295D 2652 bytes
SHA-256: a9086319778adce841d5346bf41fe7fbd13a9dd1bf6d0bcbe70b7a7060e0ac26
font_02_sfnt_off000134a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A8 10988 bytes
SHA-256: 932d74e18395698f416bb5d19995a0c0d11c9d2b11f8e56e5d650449e07c598f
font_03_sfnt_off00014e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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