Malicious PDF — malware analysis report

Static analysis result for SHA-256 f909b20fad10f27e…

MALICIOUS

PDF

72.6 KB Created: 2021-09-10 05:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1068c04a8fcde7900820eeedd9754950 SHA-1: d5a2212113bc012729928f76bfce7231033ea06d SHA-256: f909b20fad10f27e08a6feb5ab398f179a8cf0cb68f8d57eea577e75572d1bef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting. The presence of JavaScript and the link farm structure strongly suggest an attempt to redirect users to malicious sites for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=miui+poco+x3+download PDF link annotation
    • http://firmykominkowe.pl/Obrazki/edytor/file/33268199673.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaeeab2ae4---refafeberakibelapevi.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/68103723866.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/subub.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/putufezuteriribogo.pdfIn PDF document text
    • http://rayanchem.com/d/files/52219951466.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/74087695699.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/50931887151.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210901055507_x62gfs.pdfIn PDF document text
    • http://airmon.hu/images/files/duvilikawitedojas.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/30630613618.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/31546972901.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f029f0e321ac889e4d1410d12a2dd3b9/29718830704.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93f0bb7c8---patakizuvunep.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/nalupizopom.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/rizoseles.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/2075501243.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/xugazavaxawufam.pdfIn PDF document text
    • https://5uempat.com/contents/files/zikuj.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/gutarume.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138666399797---41502233709.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/fewesive.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/livuwidinebaxuwojo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/65366110013.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/safipazogumikapudanoxoped.pdfIn PDF document text
    • 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_off0000b6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC6 17688 bytes
SHA-256: 4ec22becb005428996c7c3c2277fd0be8bbb1a53315ac1c50fa6906e67ef33df
font_02_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 10460 bytes
SHA-256: 4530c3b0f857a23e5487d0394bb6512c7ee298e77cec6d84aa429028cb2abae8

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