Malicious PDF — malware analysis report

Static analysis result for SHA-256 e475293d5798d6d2…

MALICIOUS

PDF

92.5 KB Created: 2021-09-16 02:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc8a4ef865279c638c57d2245126b02b SHA-1: f035d5f3f1ee226741bce27005d199daddba46e4 SHA-256: e475293d5798d6d289fa180afe05add2ac8334826005cd40c8d7473044c27b05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The primary attack pattern involves leveraging a compromised document to distribute links to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gaushalango.com/uploaded_files/userfiles/files/88294041738.pdf In PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367e19f00c0---posatogarifegura.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/dixomolavuvuxa.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6580cdb020f530acf5674e5f4e72f8ec/23173930134.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/goridegovuvibum.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/207fedc0ee6441ae83bf866d7fefb960/30418993580.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/91523526561.pdfIn PDF document text
    • http://parentini.it/userfiles/files/sekomugamuwituzosowi.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/visozisazugejivutaxes.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/45026766234.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/netewogudizevadodovukokuk.pdfIn PDF document text
    • http://darstin.com/userfiles/files/65093274794.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/jinojuv.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161426af39230f---26013320446.pdfIn PDF document text
    • http://chpcentre.com/files/file/8371714374.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/rojomiku.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/11174698741.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/nonikiwepaladitinilixam.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/pajiv.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/vizer.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/42179331299.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16139c237c8b87---13682761468.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/robebipekexidininutigo.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/zawato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=boku+no+hero+academia+full+moviePDF 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_off0000fc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 10788 bytes
SHA-256: 26e84a28dbb726904849a79594052735b4f2d3623d2baf5e1fce5ed7346038a5
font_01_sfnt_off000114f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F9 21292 bytes
SHA-256: 83dbadde38814632ffdc3dbe6d94780fefdaa90239474b59ebc113f7f7f89d2a
font_02_sfnt_off00014c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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