Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4a0f2682e35e36…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 17:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c602836ab335beac8255c961a44a29f6 SHA-1: bc8f23f6b1690864efc226bee85ca0dc4f18ea53 SHA-256: 3f4a0f2682e35e36a59a2eee55811ae13e581ff1ecedd32dc6b16bb9cdc15f9d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript and external links suggest an attempt to redirect the user to a malicious site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://garglob.ru/uplcv?utm_term=install+adb+devices+windows+10 PDF link annotation
    • http://tortsurprise.ru/upload/redactor/files/58594467057.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/95963482409.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/gozebuguvinep.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5372199f7---54159934207.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/6487777433.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/68819600485.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/26295930569.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e6d3ef9a408f8ef30532e22c58153ad2/nuzajogesuxadopojogope.pdfIn PDF document text
    • http://zamgph.com/uploads/file/031411075231.pdfIn PDF document text
    • http://cocoal.com/uploads/file/dakipe.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/javufumevufumi.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/72493189328.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/difikeferu.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/mezojemeva.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/nuvitajugeluze.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/zumapitez.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/kefititanim.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/jinijapofa.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa53a6f687---fizejexujezofugoso.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/tidubitogasejomagakumij.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/bejotesusor.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/25120234021.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/29213960355.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/xovamiwipuge.pdfIn PDF document text
    • https://ksboutlet.com/file/files/wonujekorogazozelinoj.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/84588108506.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_off0000d7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 18940 bytes
SHA-256: 938f868f036a5380cb4f0b24071993840c3ac5bb78ac35bd0c389e4b0c4db4ac
font_02_sfnt_off000120f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F5 10680 bytes
SHA-256: bdb8e692859059d8214350aedd5199f953bbb9ac19f366cbfc9fb28360305d61

Open this report in the interactive analyzer, or submit your own file for analysis.