Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4b2afdb326359c…

MALICIOUS

PDF

105.9 KB Created: 2021-09-04 06:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fdcb86b5dc60cd32248881ec35a8e060 SHA-1: 76b05a907bcb044db73e42b084a56fb835497545 SHA-256: 7a4b2afdb326359c8219b8bb13adcca0dc5963e55bfcd4c4f909b4dbd311c4a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to external PDFs hosted on various websites, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or perform malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://kpotplace.com/uploads/files/vodigifigavizo.pdf In PDF document text
    • http://pusancard.com/userData/board/file/95886863418.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/pelivigeponixisawusuto.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/64e49b31c953ff36dd165d55424b520b/8264758573.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef42eaf5d4---koputipisomin.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/gewejejixexufak.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/sogatavesixebigesego.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a58a0645f01---31796096962.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e0f8f4c2---refenig.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/d8piucreiodt5lv5ohoccl2cat/buxugokabebugeb.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210904_F403D62491E714E5.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/98444815271.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/kovunawizigegijinifivi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7d1e3351---fegefalojufomede.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/vmcd07mdemb81j5gvic7bubvii/gemovexa.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/kibupopudivob.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/75598252794.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/50300631796.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc612ca254---newugijatubube.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/87443988030.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160941e13f2d81---fuvupudutedinizube.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/93955317809.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910d8eeaf1b---86804772711.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/60040349565.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/63398069471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=thoughts+and+feelings+worksheetPDF 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_off000135ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CE 10872 bytes
SHA-256: 2135f6519d7b634a4c13b6f77fd4be4a51ddefed3fd4d4cda457681cf0655be4
font_01_sfnt_off00014eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBA 19672 bytes
SHA-256: 033327fd809d4ecf607106e8b661550943f7751a565510d9206c6d7ff4358f28
font_02_sfnt_off000181a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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