Malicious PDF — malware analysis report

Static analysis result for SHA-256 4423014e03c11a7b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 03:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e2cb3def9835ec5dbed62b1105aaf06c SHA-1: 05525674a586facf006f2ca018dc7b71cdb9631a SHA-256: 4423014e03c11a7b857784008aec708ed152014caeab5a482a5c91cce5a7c22d
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick users into installing malicious browser extensions or updates. While no scripts were directly extracted, the embedded URLs point to various compromised or unknown domains, likely serving as part of the attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/2968826496.pdf In PDF document text
    • http://ajeah-intl.org/fck_image/file/bivokoxifimamoposem.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614559c03e805---rulezofurujalox.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/20409142143.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/37883931858.pdfIn PDF document text
    • https://h016s5or78-du3.com/contents/files/23068300916.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed80d78e6b---80828788242.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/28672055299.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439f7d25a40---tirofusikepozut.pdfIn PDF document text
    • http://onlinevay.com/upload/files/bibovofebewovukavuje.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wepapigunufefi.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/24t0mo0fgavlofebidb6frvna3/suguzuvinojewonogem.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/84484551934.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/kamemij.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210910011622090197vbubb.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613594cbf05bf---bexagubaxapulemixewem.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/sewerezegibi.pdfIn PDF document text
    • https://autoskola-scp.com/files/wijorujikubozediveg.pdfIn PDF document text
    • https://ikansambel.com/contents/files/rugomemajuvedo.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/13913767108.pdfIn PDF document text
    • http://sung1.com/upload/files/78644998240.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/4012801378.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/zuxekowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=uc+browser+android+all+versionPDF 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_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 17920 bytes
SHA-256: 93c1d7d181f1db830fd858919a97232f03865cc8ab8bf6ccee0130fe3252fe62
font_02_sfnt_off00012de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE9 10564 bytes
SHA-256: fa27109c4319e322bbd53f6414089fb47461f8b354fb7e8e7357063e70bbf6ea

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