Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ba2b4347e72800…

MALICIOUS

PDF

76.2 KB Created: 2021-09-03 22:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74665416e85899b59d06ab2839667c20 SHA-1: 2fc0d71f11f4c939b81820cb953d0718090d1e29 SHA-256: c4ba2b4347e728005d7076aa8f47ea7aa2d143ceb9009b39cc9aa001ff6cc0fe
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a phishing or malicious redirection attempt. ClamAV also detected this file as a 'Pdf.Phishing.Trojan'. The presence of multiple links and the nature of the hosting indicate a strategy to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3549

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crocepadrekolbe.it/userfiles/files/66979699724.pdf In PDF document text
    • http://dchs1961.com/clients/871949/File/71039124005.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/35402610880.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/bg1mviq5m36d14tqqet3r9bghd/jitibutimikevu.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/tigukoriju.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d3e36214b---39534721937.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/punemamaropezofis.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160811237bd70d---73085860363.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/sumawal.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16084de04ab0ad---23916425398.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/pubotuwu.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/87245166045.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c262d200f---35169379197.pdfIn PDF document text
    • http://sns.hu/_user/file/90187616423.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/baf9cd2c06aa20776163e83b0b1d4871/kokulosidudupowoxezejuri.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/rokunupufosozekomo.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7ed55741d---kolaxuzurozatorunefuvuk.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2277bd3e12---42187180147.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luwipinoxolovunofafage.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/1525221f03e8c734e020cc9012a29eb0/jexipumufineko.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/90921761921.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9dcccd2a8841a9b95ab1e4c1581a6c4c/tanuxunanatudegag.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/48759336118.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/vinexo.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/xuvavufutixakunuwupemob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=guitar+tabs+and+chords+pdfPDF link annotation
    • 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_off0000d1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E0 10816 bytes
SHA-256: f3815345761bba42f5096ee43a378c601b226db01957b12ee94c7f931c9f0ead
font_01_sfnt_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 16640 bytes
SHA-256: bbd7394b7cc0bac4b4e282f505a539603f72f4b3a053e1d8aea4c735d84504db
font_02_sfnt_off000115a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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