Malicious PDF — malware analysis report

Static analysis result for SHA-256 5657dc0855c75597…

MALICIOUS

PDF

93.6 KB Created: 2021-06-25 19:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e5e408e35bc1116d003d32b2d89eda9c SHA-1: c8fb29b7bab52f1eb638f114b4428b90bf46178f SHA-256: 5657dc0855c755975e718fc461cc333e3a705dfb2c7a79ba81e9ea8b17af6354
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://irlanc.ru/uplcv?utm_term=wavy+vision+and+high+blood+pressure PDF link annotation
    • http://technocom.pl/editor/file/musibazomafepewodexiwem.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/98168437609.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4265032a8---28527716981.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/59123881188.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c67d9de882---34989249578.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/75927993263.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/56a6fcdb444270f79ee4faf4de1465f8/83740926473.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aa85c15085c---42388397541.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/29617073099.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a3f4760a0b1b929aa620790cd4789707/pojozegudawujasiwosu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/117a8402b65f952fff15e2998566ae02/nowogijojigewewinavidaxig.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/50668164472.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4018d9d5a---wilam.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609134c70197c---vegeponurokiridiwo.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/kifap.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071f008ec751---82705156735.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/vewepoloxe.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c873570937b---45327108757.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/10565055238.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a56156b3b5---69513633210.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/murerenolefakigevixabafe.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/tazoxinigenuseki.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/dc820b200657f9db390002b39d0a270c/97943631389.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/84136754386.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-15/20210615164401674653.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7021a9f178---56727137274.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off000109f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 10984 bytes
SHA-256: 03b92d0d5e8662281fd7832a849d2f3e3db31f58c28c6157d8c61c20b3485090
font_02_sfnt_off000122f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F7 17388 bytes
SHA-256: c454977fb49505bdb7cfe30b6ceddfee25b9a1847cf785439eb041801ce67020
font_03_sfnt_off00015021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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