Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7db885e4c9f93ed…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 18:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca435a922972ac09076e271dfc329378 SHA-1: e12e21b3063de76a8807e676c8c83485051a95ec SHA-256: a7db885e4c9f93edbcae7279629cf54fcf0e4f97cb1c95a726f971dc0b8b43fc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://nomylo.ru/uplcv?utm_term=what+can+you+make+with+nether+brick PDF link annotation
    • https://asiantms.com/ckfinder/userfiles/files/faxebuzigox.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b8dcaf712---kaniveporanemabix.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/xotukoramar.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/foxamakojib.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/nilexu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77a374920---dubanomenu.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a5e18c3a---xefafi.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/lixigedanejifisawunup.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0cbf050b4---zemimojiwitidoluvif.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/62698452086.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/69557252747.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/bovakakasazibuge.pdfIn PDF document text
    • http://chapelguild.com/images/usr/bawasakuloruj.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/puzakavi.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6eba44d0a---tezevin.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/20377982999.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/popegenunujod.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/24682636215.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/xavikizilivufubekutujuvu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614232891c126---36203492207.pdfIn PDF document text
    • https://trystsalonri.com/images/file/45156318962.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/xewewidedo.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/dopelamized.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_off0000d115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD115 16220 bytes
SHA-256: 74ef257e81a56428d468c9bb9280d0237feac066729f9ff29c73acab13fd2005
font_01_sfnt_off0000fad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 10808 bytes
SHA-256: 28a54df473f85cc90a571e7d796dafec795bd9dff5baf43b78626914dc601548
font_02_sfnt_off000113ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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