Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3951c26d71f569e…

MALICIOUS

PDF

86.4 KB Created: 2021-07-06 19:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36b66a4656d2a80a68fc44dd0e62f091 SHA-1: 0172134f4de945e7b2cc5b595c0fb6174904ebda SHA-256: f3951c26d71f569ef9c57c5705b010d2e3dac0e7e1c202f9d1c02addabb6c078
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce753f7bdc3---nowakifonukamejujiruvilul.pdf In PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d7bf4fbc72b1de17661daa07c43a68c5/vujokulusijarananezizez.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/bodubo.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/10028240230.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819dc20f786---nesisozirurewutetosak.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a150f09b1d---33006065980.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e272dfcacfb---30373296487.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/579cfd522c0cb1728a1afeff77a7934e/loxazemetesabejotewevim.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/pozudajolorasozad.pdfIn PDF document text
    • http://atomleasing.ru/media/File/burederunew.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3c722d80b---53143331426.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/15086656339.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/maxelidomebasejekakexe.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/4914533138.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/g1qf0m1i6m4kcd7p0an7epcf57/83074589613.pdfIn PDF document text
    • https://rm-parketi.si/uploads/19142628408.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/b157db365a382b547d62ed93036ee601/xikigenurebow.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/16412931e60b48479c0087c810e6c830/wupuxid.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/9172347817.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/nesogujidizagopap.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/54849543591.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/99650991248.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ae77083c7a1---83996709497.pdfIn PDF document text
    • http://abpaluso.com/upload/file/70423069466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=playing+piano+with+laptop+keyboardPDF 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_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 10936 bytes
SHA-256: c0dda576f9b3a1270d81be581ae2c2752bfa38e02695ff3eb06510a0705e876d
font_02_sfnt_off00011fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA8 17032 bytes
SHA-256: f22ef427d58969ce37742411edd676e1b2af4c2e44e5b37303317e14d6b54797