Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a09b5518def7df9…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 07:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06cb6ab75fea56c78e525c3b9e572979 SHA-1: 660df480cf74c4424c26e4f552630a9e242afffc SHA-256: 8a09b5518def7df920347a22e7b3d66b074a26d36bc1aa4853fbc3a38bd29acb
164 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggests a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness. The document likely serves as a lure to download a secondary payload, as indicated by the 'SE_DOWNLOAD_BUTTON' heuristic.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=monster+legends+mod+apk+gems PDF link annotation
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/76821729182.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/83603884810.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/doviduretaf.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/nemiledoxeleziwetejodab.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/rumogarujunemetazifekat.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/maxowowitonebexojagago.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/superirewurutajorubeloxu.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/tefodeduxug.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614661adbb1a4---73051273172.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/tifet.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/dovulebipo.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/58581972481.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/73481444604.pdfIn PDF document text
    • http://popmetre.com/news/files/fipamozotajede.pdfIn PDF document text
    • https://badoza.net/userfiles/file/36551464505.pdfIn PDF document text
    • http://mcutech.net/files/82006051142.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/jowebupesofofon.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/e0b2k2oloshgclm2rtei8smjs9/83781049846.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/xebogoxojowapomizebos.pdfIn PDF document text
    • https://ka-base.no/images_content/file/lurinapafasonamaraped.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/bebubu.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/timekopu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136d854a5911---nedevaritimife.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_off0000ddcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 10728 bytes
SHA-256: f2df9d7dc280a43b91806e9eace42b962d678cf4d3939df8cacf2509ed9f8154
font_02_sfnt_off00010e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 18324 bytes
SHA-256: 2aeff02e9b10d910b058a8a47da04da2051722340817d9009899d931c7f65eb2

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