Malicious PDF — malware analysis report

Static analysis result for SHA-256 e158e272d4242b65…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 07:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f01fe77b262b550c76ee242957da63ec SHA-1: 6dfbb311cbee726b8fcb579e385ac4716d4f9975 SHA-256: e158e272d4242b659b311d2161b7098c185475c8d6adb878fd6d2203fc24ee66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. These sites likely serve as a distribution point for further malicious content or phishing attempts, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971f100d45b---35526124858.pdf In PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bddd28ff7c---87285693833.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/visamozukiral.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/br9s7drleembb32dgsagoktei3/xosope.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/23438090779.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/mivadumenotenowegoxuxan.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/lozofagafasib.pdfIn PDF document text
    • http://supporttmes.com/clients/2/26/2647aeee05d38019bb2ff7af4ee9f9d5/File/47783628764.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/mofenosuze.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/79938672589.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6476c1bf77---9681481831.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c01ee4395a3---tisugimipejene.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/wijokug.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/52872660271.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/954c50cf8d61a847455064d811126b2b/60596260372.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610bf25a1ad30---62897229507.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/rilidajelogafelazedebo.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1a52eaaa728ae8c5e090770c8a29f1c0/72250080931.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-08-05/images/files/80636399964.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607340329ca0b---fafokopeguw.pdfIn PDF document text
    • http://ahknchem.com/upload/files/62587393071.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e31e3383---83323858058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cloze+reading+passages+1st+grade+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_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 10816 bytes
SHA-256: 0b98c99000ff2bff7565de30774f4207f257856501b01a666baa046f4e69d232
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 16976 bytes
SHA-256: 86c6fc58f6807aa4b13bc99e8a896898a932fe54e92d59fd7bfeb0f0a06dfc9b
font_02_sfnt_off000122aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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