Malicious PDF — malware analysis report

Static analysis result for SHA-256 459e1ca41fd6fd58…

MALICIOUS

PDF

74.8 KB Created: 2021-07-03 05:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1b43311781e7d8529b066e5036e5ffb8 SHA-1: 69579090c3be63cb69cea9daf7d5e42103b66fcf SHA-256: 459e1ca41fd6fd5830f8599a713e8d938e696be5bd2575ee5b477dfc94f744c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/18690018222.pdf In PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/3ea13e887a4fe3b767d5d47a405593d1/90458023053.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f193af1ea---ruramixawobenupi.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/xuwubinipadezi.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/0d9764af556572d9d19e0ef2bd7b5cee/89206979769.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/gunif.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/kesuzowurarozijidewikomo.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/firezasawoz.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0c309ef1---gefapaliwuwitidaredag.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/f0d4b3bf82b316c0a226ed2a13ddb04b/vobevolazodovibakusez.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/fezof.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/sikiv.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/waxazonuja.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e89551f044---lefikufewerusotixikudo.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/desowumunadazapukubozazab.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a767c35db03---93018135963.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f214b191613bcf3f0d85f13cc87bd8a5/rabetu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18ea6aae2---kegotinugosipabofafuvel.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080916ebdc2a---xesawob.pdfIn PDF document text
    • http://flomojapan.com/upload/files/78490345288.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda6f6382ed---zovegadawewogasu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/l4tlh10gf988ufsjmqr4csqtln/mukabenonivaza.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/tebiwapinuwofisigefedap.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/58998497343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=maple+leaf+forever+bagpipesPDF 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_off0000c328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC328 16548 bytes
SHA-256: 2f7c58e2d445a82bdf1ec692a3c183ce4978f164051e88fdc4c32b744fc0eeb1
font_01_sfnt_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 10528 bytes
SHA-256: 964a0217d59ac647b35bb822919d96f6e106e1b9e15bb3c6744dd18c340f8ce7
font_02_sfnt_off000105d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1