Malicious PDF — malware analysis report

Static analysis result for SHA-256 909f8dd8a54d1c32…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 10:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14301018a702619998e6157b029b3dc0 SHA-1: ea10d201b2d4e94c94b882017434f264dacd9c16 SHA-256: 909f8dd8a54d1c321264ef2d58b83f31948d2cd63761217b849e361d17a9d66f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous heuristics fired, including PDF link farms pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the PDF structure indicate an attempt to redirect the user to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://gamaconsultores.cl/upload/file/57959984910.pdf In PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/3svtfqspbec2bhkq4e18ttcmdo/11213711863.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/sazavunuvajokoxafekuxe.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/22210109632.pdfIn macro / runtime command snippet
    • https://heritagecambodiatravel.com/userfiles/file/zugifavoxagan.pdfIn macro / runtime command snippet
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/74448505659.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5fec6f5ad6d315cf9e5c72151e15622d/putawojojudo.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/61247821190.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/50613068543.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/difowuguvisezob.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613252c993def---pavore.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/pedalefi.pdfIn PDF document text
    • http://www.toptehnik.si/images/rafobi.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613676ecf2870---2294288780.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/zizuk.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/23075692392.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b36aa057de---likuzirisesobofur.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/wibuvizezaxidaru.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/gemufewiforoxigikud.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/rimirowabifijewuju.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/h7k605pja63j81j82cl1o4vt10/barive.pdfIn PDF document text
    • http://abworder.com/uploads/files/30634108421.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/fileIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=landscape+mode+video+androidPDF 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_off0000d40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40D 18404 bytes
SHA-256: 2a29b1e24577361500478146c835d1f4ed181107039782ed45a480fee62b34f5
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 10552 bytes
SHA-256: fdfa6b2b6e16457d0e023f1a9ef5f679f6755e8e5dc36574bdc613adb696c348
font_02_sfnt_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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