Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8bfeb3c8ee6506…

MALICIOUS

PDF

77.0 KB Created: 2021-09-01 05:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 09ef23e40b28fab32bb9dcc822099c76 SHA-1: 018a80456b48837727ca71b4a92dd2b508281191 SHA-256: 9b8bfeb3c8ee6506b7c7ce00269074d15682260f3f1b53a6d47f47dd2af6c792
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links on potentially compromised sites is a high-risk indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d22e8f1f97---86041027698.pdf In PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85762487924.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/wizowakaz.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/e18c79341640eb09cfab6f1595b4e7ab/59291439392.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/nixuzanosifi.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/badodesinaj.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ff53edb42---polamutuzize.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871a7b2aea7---98045998038.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/lsl0reh5523gg6linq537kj6tg/tediwevexupijivowoxo.pdfIn PDF document text
    • http://manu-transport.com/documents/file/18395071830.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/xomefimupefupividowi.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/84145965942.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/wekonu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089045957ba8---wesosopowisimelamo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090960242677---70434286475.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612d4094a1f21---latixifotunisamib.pdfIn PDF document text
    • https://kaparatt.com/images/File/70467929112.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/64107609372.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/wuzodinewisuj.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/f07pc3849jbd0arb33pmbtrpoi/6137652839.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/fifapesinexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=lcm+of+91PDF 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_off0000ccd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E6 9772 bytes
SHA-256: 430af2b7e00f93589fceec5d6455e0eccdd4ca4feb7b3cb4c4d8533bda672864
font_02_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 17128 bytes
SHA-256: be98c0b7deb40721a4246bd71345828ea7c5d3a3baa6226ab0acada122521e41

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