Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7c474c66f32a65…

MALICIOUS

PDF

86.0 KB Created: 2021-09-04 05:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c7da9548b14cdb0a1de7ddec78588da0 SHA-1: 7e8a73d7eac95afc9977f11e418f5d1db7c97582 SHA-256: ee7c474c66f32a65205a5424bdda802fd9e9834991eb774e9d612e24a3c19db4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically identifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of external URIs and compromised CMS links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610e411e7508d---goziperamejadafuzuf.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4d31af7e5---65906979619.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16070d65ea61e6---kapezakuw.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/24732141980.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/3dbb0429eb1f01687a95ffb4a38a625e/soturek.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/kasufegirowaxe.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/vizirirabuweni.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/76120716479.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/b2cv9r6tmi0ietc0k44m91ctn1/88267876865.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/34680197438.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160de5fab1c852---tevinuxovopokapopuf.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161062e7e776da---99558638015.pdfIn PDF document text
    • http://e-sportis.com/images/upload/71256299209.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4a0843ba6---87435789374.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/67550555599.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d36d4783a94---83634922486.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/16b6cfada930942f4e8e8801e156237d/jolozebojebobemenatoli.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/23185645697.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/82835547651.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a544f4babe---kuzaganesukefawufim.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/xoxatilamagasifotumutinok.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb00d98a91---28515199003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ap+grama+sachivalayam+results+merit+list+2019+pdf+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_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 11876 bytes
SHA-256: 53977bd7b8047c472d30e2e20404a83c022e34ff90fa8a16fa73163aca638fe3
font_01_sfnt_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001116b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116B 21320 bytes
SHA-256: f30f2e8800decae8bf1e8d80b87e2633c34321f2f13266232d50afe241f5a1ea

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