Malicious PDF — malware analysis report

Static analysis result for SHA-256 a408ca41286082c1…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 09:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4375bbfd0d976311cda64ad842f90f73 SHA-1: bcd4c0d5535bde3e8a6a494dabd104c7cfe8413b SHA-256: a408ca41286082c162f55e2dce489539317cc08a21d36c82fef19374e6049886
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The file's structure and the nature of the URLs indicate a likely attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tidymoney.com/ckfinder/userfiles/files/84194221906.pdf In PDF document text
    • http://88cpap.com/userfiles/files/riwuwizevi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06f937ea25---jiguwozidereval.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/fibekaxajibav.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083da6f11b6e---15383688196.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/434ce702b2ad63ccafa9cdb9a93b7aa4/lewelanigirijobif.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/110297a5d66478ec45990adfc4506161/vemomokuxubiwijuwisifix.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/kezimosazixu.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/45611195216.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757a8f0c067---vatewute.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608672ccdef67---10609680728.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/zutelinajiparavox.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01b36f933---nafesazuni.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/isp2rn1h52ugl7ho40qu6c4099/kidom.pdfIn PDF document text
    • http://saydersan.com/firma/files/96433992495.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/144fa152e57659172105d9a43e7633a4/58996813967.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/xipupinemo.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5lk3vf0f7enij8cr7knq5cuurj/37852068242.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/2675368310.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/rikolom.pdfIn PDF document text
    • https://bak.vn/upload/files/govefebegowegij.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/sanijaxunikiwixubufetos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=present+continuous+exercises+questions+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_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 16956 bytes
SHA-256: e4c7153d0e04fd2773075e49f08b1135ae6a9ddc49a96f6d0a359146af370bee
font_01_sfnt_off0000fe2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 10752 bytes
SHA-256: 2048976a40eedffae164e61e835217bc1b09ab7182f7732854957b6379676d17

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