Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4bddfbd32d0c8b…

MALICIOUS

PDF

101.4 KB Created: 2021-09-10 19:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d3a3c0c4f42188ed9145ae1aab77cbd SHA-1: abee13dd4b98737736c592ba1bfee3d5664be5de SHA-256: be4bddfbd32d0c8bda0076f7d3badb323d54eb491d6a54aab7217ee2439c4811
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit users via malicious links, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://immodraft.nrw/images/architekten_agentur_images_/file/48368223389.pdf In PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/1810875056.pdfIn PDF document text
    • https://electroagro.es/pub/files/68207256455.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/36029396765.pdfIn PDF document text
    • https://architektor.ru/uploads/file/vomuwa.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/88163012975.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/94274196397.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/80207571778.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/44945451892.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5c35b257---mefiwodesizidipavatuna.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lpra5mtil4vco3st7vb3cobt73/11135808195.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/86673176993.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/jezebotedunixesovuwiba.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/024710a323ee90a62cb116680cdcfeb3/65091973725.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/17330643252.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/6730517843.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210909_E2A08862DE1CA89B.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/29904260564.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613976c0d8dfc---mosawetikovexisupelipi.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/palezibogabik.pdfIn PDF document text
    • http://1careglobal.com/upload/files/jagisuroguxovekabujogu.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/83586165428.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/65461063019.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/85189251093.pdfIn PDF document text
    • https://506hlapeta.com/files/file/50852674572.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/fijegamevomireropu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+tower+defense+3+hackedPDF 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_off00012210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12210 20124 bytes
SHA-256: 9ccdc08826d1cdf8fac2d09e4e673b7518ab20172a2ca2f0c4a67f3fcd482534
font_01_sfnt_off000156ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EC5 10956 bytes
SHA-256: 8d985df2808a0affc710e1cf98088e26f2db2d0a52684320b3d35647831b92c4

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