Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a04b3fee17c8ad…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 11:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26ed5f34664f562f7e43bfd9d7cb7c87 SHA-1: 0f50360efbe266640b9e6561fa57650e58408d8c SHA-256: 40a04b3fee17c8ad161e8c65e99a0b2a82ad2fafa6f3e58d769c6a3e759e67d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with multiple URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. An embedded JavaScript stream was also detected, which could be used to further exploit the user or redirect them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hurghadalife.net/userfiles/files/74985555818.pdf In PDF document text
    • http://balcimimarlik.com/resimler/files/buzoruleta.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/5095565580.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/karepitop.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f55752bee6---89752951277.pdfIn PDF document text
    • http://teakdeck.pl/files/file/53115456545.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/fifitifabotowusukifezaga.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/beturilowexuminife.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/14947594.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/bunidemufonibukede.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/linemuvukomupumoxewag.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/23a2704358df17a0f724fb6baf79d39b/21753584227.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f257529393---dowupiw.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/34285668468.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/jobenotodugaramevaluje.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/bowivovukosojozubofuwuso.pdfIn PDF document text
    • https://almavilag.hu/files/files/nasuwavowafu.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/72248840488.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/kuguwevexezofasejox.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/24949338492.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/gutikaxuluwamekasojinuxo.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/merowolatife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=jamie+ann+naughrightPDF 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_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 18772 bytes
SHA-256: 02ac8e7a03fd4d683a5db3d278433a017861aeaa35b2c425f8e07b34aaddad34
font_01_sfnt_off00010ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCC 10312 bytes
SHA-256: e23778fee7cf0d380136ce4afb12e679571839e6020bc3e071681fa916ea3c13
font_02_sfnt_off000123cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1