Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed42eb61c0cc481…

MALICIOUS

PDF

78.1 KB Created: 2021-08-28 19:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4c2128ad92e8bd2d50fc0a4f95d8fc6 SHA-1: 5db53a02812428ab603a7cadaaa0ef7903bbeb74 SHA-256: 9ed42eb61c0cc481eab03e3cddf21fc9340f1f16faf6ed0fcc51ace49528cba3
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 functions as a link farm, directing users to numerous distinct hosts, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest a lure for downloading software or accessing potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jrpst.pl/userfiles/file/mafunazitekano.pdf In PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/lebitavotiwodedaf.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/a43b567a28c2e6857ec100d04d1db493/geluwapapugumufo.pdfIn PDF document text
    • http://emannsltd.com/userfiles/lenalomapil.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b06cfc6d868---85193139393.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/53229207489.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/68741070914.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/tjmh1bm4jvnpm2r41mlf884pd0/22743394274.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160829fa1c19d3---57797265874.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/a9b8gtckfukq68n1kbe08hke87/97241142278.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/47945465893.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/mejawuvegopesogavizinabu.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d71a9952816---27539342730.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/b82a7defd7bec9297c9c4d1f353c1b25/36663277846.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bce98bdf2---padago.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609026e81cbb4---14419515075.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fc33b28ec---63126951123.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7853b447c5---senaloxuwukuvivarekanudav.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/281fb91a16c67cc6578fa12aa9ec0cd5/dolezutufubupejolib.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/aed383bf4814b388a17d0a46974ab99b/26801555163.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d34bc03680---buxew.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/pibagowigejuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=wyse+device+manager+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 18228 bytes
SHA-256: b6c61d20984f9654ce360e34a9e9f3eb4c0d27d9ba5c1dd23680bf9f52504e76
font_02_sfnt_off00010f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F55 10876 bytes
SHA-256: a5dca40413a33151ec494366411f6744a8132ab23596724ccba1611a44a514c1

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