Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcaac9d08270c57…

MALICIOUS

PDF

108.2 KB Created: 2021-09-05 04:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e58602c225d91ad7427a9e65ee51233a SHA-1: 9539dc8c73215e4e10057566fa3fc07d0b4cbc65 SHA-256: fbcaac9d08270c57509d4e3103afcb091aa947c1228b26ad30748f28cdf7b81e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress upload directories. These links are likely intended to lead users to phishing pages or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/u0f7nem9eoovf999ulkkldikf3/kamolejub.pdf In PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/78817015198b85fee01ce7761534761b/tuzikiralurusovekifopod.pdfIn PDF document text
    • http://xenangheli.vn/public/files/vifisuwunovivatumebapubil.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/573c85f62295894a464a126b8a908ab2/51088917751.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d94ed4a63d---6012291340.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/bc07c482a6037f6d6359dbc307359700/popexujuwo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/905197245db580a31b7fc83f81e8c2a8/21598325797.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/gozopugujarumajidoderu.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/5f8a2df0ea76fd262649cfe4b75805a7/29882893363.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216312902903.pdfIn PDF document text
    • http://stasta.com/userfiles/file/dajine.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/81463970271.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/visiz.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/rimobewebogobaninev.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3480183e73---42503643719.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/58036407958.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/015cf7d514abb96f348ea6521649a407/30851053761.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/jigif.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/kasowunigamudetavobubi.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/74ed5f145a8eec2b9435c040f152d7fc/34638964221.pdfIn PDF document text
    • https://fasaac.org/temp//files/mugiwubagebirewi.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/4c3cdea437142ed6aff505aa5ac7eb65/23937944692.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ef18d6163750719ef8dfc824aa7282b8/vodolofat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=demythologizing+heidegger+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_off00013c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15427 21444 bytes
SHA-256: 2b63e5c3a20dcb137076d4df7be35976cf1b629bb8d88cf102698d0cb9a26b17
font_02_sfnt_off00018aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AA4 10792 bytes
SHA-256: 69527eca772463e2a6a6d5fa06806bf3070509ea38a3cb793da69e584e45ac41

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