Malicious PDF — malware analysis report

Static analysis result for SHA-256 f338510c17190bf4…

MALICIOUS

PDF

89.6 KB Created: 2021-09-22 11:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e64fb7e4020ee47a6b0fa85fab6e7bf SHA-1: 7acf1b13c12f774d3a4a308bd13c00add6f70c15 SHA-256: f338510c17190bf41fad9fa4fe450121930144e55d2daedc9e83fc0d2a607991
196 Risk Score

Malware Insights

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

The sample is a PDF document that employs a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic for credential theft or malware installation. The document contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a phishing or distribution campaign. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • 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.
  • 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://pixomot.ru/uplcv?utm_term=how+to+do+a+screenshot+on+android+tablet PDF link annotation
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161424fca14645---dupoji.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/bukavutobavanuso.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/22310926387.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/vefepurabusipelob.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/11377892832.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/75305117592.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/27011374954.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/5443924650.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/92390099339.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/48585964657.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/sivaraxidewere.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/61425561c57c1.pdfIn PDF document text
    • http://inica.org/files/file///88642436884.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/vumapefosegege.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613445bc89bc8---nubukivujegerikidu.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/14287436160.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/jakonolugegawuzevo.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/24239265125.pdfIn PDF document text
    • http://sdes.in/uploads/46061431886.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a6ddaff16---narur.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/zujuwelinisu.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/31662442846.pdfIn PDF document text
    • http://vit-physio.de/file/zixekomodoliz.pdfIn PDF document text
    • https://sudahhabis.com/contents/files/22935240200.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/nomepigazimapimolagor.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_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 10684 bytes
SHA-256: c5a3d474c5de8001573e969968860873a13965d5ed8476eae6c68a9cc27a0a76
font_01_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12630 19444 bytes
SHA-256: 8f22daeaf9b9be9cb882e98c5e9450ad3ee1a6f524be8bfc70631769f2d0094f

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