Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec3368536a35be3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 05:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1b7450136c337776cfb74cb02f0fc312 SHA-1: 519c87870d59723a8bc3f9e6c39872ade3066046 SHA-256: 7ec3368536a35be39f09972197dcd4cdfe1d6aaf98fdca33114c6dde1b86ffe0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm or phishing lure. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific content or intent beyond the observed link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/aa8fab9c647c6c200d5a5e045144fc48/mogivirutotavuwerakifom.pdf In PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3e6738d94fc96054e340369e071794fd/76655147169.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/3evntpartk3nuagagiodoffp7c/54861114449.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/54111336525.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/89a84fe4180659bf63ced9d8480ab18b/lobum.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d4db7a34c18---9237575909.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/bumabilekudifedasifu.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/texefukomifewonexata.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/legabetomojojuxupadob.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/62632762678.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/29o3tpgum341al3s0f5orgqged/72751858171.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/54976639893.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bbca69ddf65---gupeketekisozop.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/xizune.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c41ca3b2---95394365019.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/29674136727.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5b4a401dd---48712843937.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89e985262---34481925976.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/lexebafigojuminufariza.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/73ld0l9lb93419ri3jkqcmi737/95628679310.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/riburagugodefetamipojajef.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/418ec03b6f618dae8f5241dc18c29a56/fapomulifez.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a528fa77afd---71013609512.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a4ab21bfbf---xexofawigonexaxet.pdfIn PDF document text
    • http://gz-gm.com/uploadfile/files/20210817_222443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=materi+plagiarisme+pdfPDF 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_off0000db4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4E 10608 bytes
SHA-256: 706d819c006764db056daeaa725288acd6b1e021357bb38933619cb5b873d54b
font_01_sfnt_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 17164 bytes
SHA-256: 943522d758cad88282d6048e9e7bb6a25cfdc80456527a1d011cbbfad400b60e
font_02_sfnt_off00011fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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