Malicious PDF — malware analysis report

Static analysis result for SHA-256 52220111d33963fd…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 16:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d89973cee5ec441bccd4ed72787b4b7 SHA-1: 177cd6026545ef539ac3817f1a3cc64089f431c1 SHA-256: 52220111d33963fd06e7592e2d47f3ba6ff3f1811d65a3584b4054a380794ab2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to direct users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are on disposable hosting, further supporting a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/0iep9vegiis4tjaogk27hkorr7/watadiwatiguv.pdf In PDF document text
    • https://aartipalette.com/userfiles/file/tuwawedap.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/31868121518.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/c1di1rmde4tejits4gmnl8lrmv/geniror.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b5d8d9a26a5921e3633d4d71911eb8fc/ditenujigifefedafutiloxum.pdfIn PDF document text
    • https://pecsikult.hu/files/file/95922062942.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1324293e0c---55181699860.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607943af21f1f---jakezibitiler.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6f72acbad---tetasofiguli.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609892c533526---movugakovazefadej.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/fikefewasixizu.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c50823438---lutudobepujajelobosuf.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/jiripaga.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/s01e3nnnfairga1kppl5dh21n3/jemopowopejiwawoz.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/75992089921.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/35372739762.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/5tfn4s2dks3p67vgd3iecu9k7f/mapugixuriko.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610de549639f0---18738319509.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100d581d8104---togiwuwufexabufopabugif.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161137f9ebb772---26003583828.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e412f80cd0f---likajawo.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160df47cc6d6db---jaturaf.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/kigewipigatureputez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=air+brake+system+in+railways+pdfPDF 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_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 10952 bytes
SHA-256: 38e064d9e082a9aa34af6073c6a7689279f89830337fe2fd04faf23d038c0bed
font_02_sfnt_off00010e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6F 16644 bytes
SHA-256: 839e6f5e6f04d76d0948e5fbe86961bc64035068290fbf234ce2fea9f18f6eb2

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