Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efb353eed1b1344…

MALICIOUS

PDF

73.6 KB Created: 2021-09-12 06:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a1d1a3b706c5b3d1ca58d39e9048e8a3 SHA-1: a5c06db044d702b412af86965f456387f290b035 SHA-256: 0efb353eed1b13445d7492e5aa6dfea050aeccf19faa6d3c1d653370c45aa4e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://eko-gospodarstwo.eu/files/file/845632641.pdf In PDF document text
    • http://pincodehub.in/userfiles/file/mixaxaroka.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/bujenabek.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/xegukozoginonuwe.pdfIn PDF document text
    • http://stroi-sistema.ru/img/vopixaburuluzewazoxukov.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/99239792872.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/dajoxarodifalotexotenobu.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/xolisutubezini.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/38776462207.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/19885406646.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/nafeserivusovevuweliwodut.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/27950110368.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/guwofetupalewem.pdfIn PDF document text
    • http://usagimatur.com/files/others/roridupozutexuvakuvone.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/00ccd5bdb87ab93596befc17747d2a26/46239858336.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/sozesemuluzo.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/diwigi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130059da5ff8---46199694584.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/91574612099.pdfIn PDF document text
    • http://napiarsaigh.com/images/redevabebanobixanati.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/vi8e8orbj2qpqittqr8frd5p44/kalafapeter.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136052a1cd90---xifawujijigeto.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/saxive.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/komeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=a+transaction+processing+system+is+concerned+withPDF 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_off0000be8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8E 15632 bytes
SHA-256: 1583dac46e4f77c9da540db2f6ea628e31a797b45081d0f83f00e854b2c1f6f6
font_01_sfnt_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 11096 bytes
SHA-256: c92eb008c5c315b581172b067cdeaf6beec7b8d3bb4bf3837674852be40f4690
font_02_sfnt_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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