Malicious PDF — malware analysis report

Static analysis result for SHA-256 42da759d13a39f66…

MALICIOUS

PDF

89.3 KB Created: 2021-09-06 11:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58d3a27b2b6d9f0fb303fc38d35fe534 SHA-1: 139c3fa9003148c63dbab30c1e7e62930e85ba79 SHA-256: 42da759d13a39f66f67609bdbbcf0c047d5de88b7718ad83395aed0f278d0634
172 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains elements of a fake invoice or payment lure, combined with a call-to-action button, suggesting it aims to trick users into downloading a malicious payload. The numerous embedded URLs pointing to compromised CMS uploads and disposable hosting further support its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0f6d4174a57cb42d36b24e6c23c39399/78525252965.pdf In PDF document text
    • http://greenreunion.org/clients/f/fd/fd69eab1634eeea6368acebbe5d5cb0d/File/bokikijuxamum.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/79473848688.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/lisudabusa.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/83026390319.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105190412066231.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/mexebivawim.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070155ce69fb---32770206076.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/kavoxujukefajaj.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/tilebukodozoga.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/menixituwepepi.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7b230464---3601952739.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/waworopobavujigofo.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/9cbos60adrqtfgsirn3f7t483r/rozame.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a78a3e5164bf2f0348de82d0afedf30c/52344046039.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161107a78905c3---logeduk.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611f7ce5a39f3---jetepoviwosabewaz.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/31282838158.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/wibarirozixupumotiseb.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/eadd6091a493c44ca29f80b3a6dadb91/zomebixavagemul.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/vafisujibepinuwidi.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/8561b94d844e77c45056d46618520286/pimop.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/65923041466.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc8fe2f12---47571892646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=software+frameworks+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_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 18284 bytes
SHA-256: 31e0fcaf0c0f2d9e8a2cd44f2bb1052c72027979c1d2ba59a40736e8e3abf9e7
font_01_sfnt_off000126cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE4 10668 bytes
SHA-256: 64faa340f801cd4b1c9ce03d7986dc640220b6770b25b1f99881f0ca9818b7ed

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