Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ff8159ecbed0f3…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 11:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 59aa52102a9ab39b87c499c573208eae SHA-1: f46baaada69aa81179a636210d70eba9b1bd5ee7 SHA-256: f0ff8159ecbed0f31299de244d705bfc0f920015cb153ab435a43e81219d7f85
204 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. It contains numerous links to external PDFs hosted on compromised or disposable domains, and employs social engineering tactics like a fake download button and a browser update lure to trick users into downloading further malicious content. No scripts were extracted, but the overall structure suggests an attempt to exploit the user's trust to initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/15s2fvbf72nvigohdvmht9vplc/duvozejuzirusijidi.pdf In PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b4d74482f---31097956833.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609faff04b879---jumisinabegorije.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3f481014bc1022af952f0dab42f2d630/senejodajofuk.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/gagixivulamomatepunuru.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/9026518141.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20218612213383.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a55ab3e9c49---vikawepiposutagepuwiri.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/17118855281.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/85734532230.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/55483815930.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/26215721101.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c3f12d4b8---rovuzitajililozetowip.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1c86c3912---kimipapikinifiz.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/83568576495.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25cc39516---gobepajununamozuromo.pdfIn PDF document text
    • http://yuli-china.ru/d/files/54685040186.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/lumumupupolu.pdfIn PDF document text
    • https://magerp.org/upload/files/detezefajawalasajapesozam.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160793752c43c1---76090102333.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29fd0f2827---61612581324.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/banilakudagi.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/88410563961.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160765a49c487c---87848991131.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/porojox.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/19075002938.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/goxosazodiwalodijudexedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=in+other+words+mona+baker+pdf+free+downloadPDF 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_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 10940 bytes
SHA-256: adfa3fd1964f11d1fc1dd0a1f60978414fe212bb71a64f177a24770176903618
font_01_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 15972 bytes
SHA-256: 74498e5af93a4ec3dbc6151e64ef258b0311494a8c1d1fbf19b042ace1544e2d
font_02_sfnt_off000130d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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