Malicious PDF — malware analysis report

Static analysis result for SHA-256 147ce8b4681e336a…

MALICIOUS

PDF

85.7 KB Created: 2021-09-11 13:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ef3f7ba164cd4426992dad4e0977746 SHA-1: 4344cf9ad5c4bcfd8cd49971e4f363f3585cc0ba SHA-256: 147ce8b4681e336acf201ee695ed21492504e423a16c28a73cf3b4532a776dc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' parameters in some URLs further supports the idea of tracking user clicks for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=android+emulator+for+i3+pc PDF link annotation
    • http://keyflounge.nl/userfiles/file/50362878009.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/23092902148.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/rutod.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/60550117724.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f11b62a7e22e25bfc035ceb6e43d4205/86116071716.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/fovexuxiwod.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/xexivegob.pdfIn PDF document text
    • http://ccadl.com/files/20210903142115.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202193925394639.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/xitebav.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68582538379.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307a5ec34dc---69496671092.pdfIn PDF document text
    • http://gibisch.com/files/files/58485952195.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/37808937644.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/kidejadiwuwuvixodoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387d3c676da---67828076989.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/84720356551.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/45886848025.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/98371532337.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/11395977939.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/70589451345.pdfIn PDF document text
    • https://10fci.org/userfiles/file/vibaxaniwid.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/gibufalo.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/55899612789.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_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 16784 bytes
SHA-256: 50127f89afb09be47a04351f49c8d1de5d7b5bc2a4426b8770ff0f6e51f6baa4
font_01_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 10868 bytes
SHA-256: a5b62172366d15e33e095ec849bd486d08cd8472fa0d2b87af5661bf59afb91a