Malicious PDF — malware analysis report

Static analysis result for SHA-256 532e06517f13515c…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 08:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 53cf6f21d0f6629be6e43834e5fcab18 SHA-1: c066249f8b96e6ea861659d52c25d14bfc61ca06 SHA-256: 532e06517f13515ce1e2c855dc9d70249e926f01594587726f0e2d904539e7c7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high-confidence ML classifier. The heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage, specifically WordPress sites using the 'super-forms' or 'formcraft' plugins. These links are designed to redirect users to potentially malicious PDF files, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e879c3e05b62ae6511ca37aac6b5af2f/kebovudidedavujofobab.pdf In PDF document text
    • http://meble-tk.pl/userfiles/file/difizexukiwotupib.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/l93vhl2d96qceca2sh5h2tek0u/28071488109.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160769a6ee1bdf---98909653552.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709f2d34701---48397426690.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/85cra9rh6ev3b6a70jpkutqfth/4773706575.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/62795149584.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/h4bckurhhmsh5tuo521jaijtfc/nuxulosujofuxirage.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/bc97c2f7218894f817bd6c375db13a2f/51856176166.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/lafiwuwosivol.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cedece19a7---zilugosutejalufi.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/dogovuliruw.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bb0854148---32059950549.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e534272b2---49830727596.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e5a1a9d267815686c427970ddbdfb9bd/lusalofoneno.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/gpjpseihnm9ev8kuglir8dvsa1/24459538558.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/46792328516.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/73619066126.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/60357459247.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/litirudederuliba.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609080d01ff06---75964733219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=calories+in+a+serving+of+sweet+potato+friesPDF 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_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 10716 bytes
SHA-256: a10f7123e6292ed8cfcd0a0bb50a33fa265c9a878bdc844511a17eab3c70c235
font_02_sfnt_off00011705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 17316 bytes
SHA-256: ca76183d6a216e948a6cc2e6c48f504cc06db9b6b08581e9ee79587f343177a2

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