Malicious PDF — malware analysis report

Static analysis result for SHA-256 30893d5f0f43aafa…

MALICIOUS

PDF

87.1 KB Created: 2021-07-17 23:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3483a91da7406c4d6b6d82d25ceb71e4 SHA-1: d2318bea62e0809f5435468ec564705b4608bbc5 SHA-256: 30893d5f0f43aafad7cbc8a03bf4629a3f9efdf5b74642722ab4d1f9e11eacca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly indicate maliciousness, with the ML model outputting a score of 0.997. The embedded URLs are designed to lead users to potentially harmful content, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/bdf3a6efd1f79f47deab1292f8f2043c/70614650699.pdf In PDF document text
    • https://kede.org/userfiles/file/78681465405.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608418fcefb61---5603158441.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c1ba37f6c---78602933334.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/n3lgfb7i1t9cs78sh9d05u8m89/jabaxomojesokonuguj.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de0ff257e54---jixarerofigu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764b0f601da---difenibi.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/kudipola.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aedcd0e910f---16975489376.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/16u8h8bi9ctbkepv5nclajcdli/natijamonodo.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/tidokokimepitesuzojuki.pdfIn PDF document text
    • https://nadamasristorante.it/file/naxefoxanuvuwazo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99310aa860---46841156387.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ba7d8a48---bejiwuvexewijamajusozalob.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/086225e391f116fa84c6d2a47e736473/vijaloxejuxipaz.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/13622575811.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838f127d67e---33310407947.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/kababajalelivituvexu.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/m0r3ohh1nqslvco9sj606tp53r/47300032997.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/gawikalomukoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cape+fear+watershedPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/985093c0bcbff75988ae2e50762c42c2/jonerowinisilamopuvokegu.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_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 10348 bytes
SHA-256: 9b4def7dcb4a02b759efded9f9779bb61e7bba60f2abcb09482c8d95996ee7dd
font_01_sfnt_off00010987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10987 17116 bytes
SHA-256: eddcc963eefffcdba45e0df90a3b4bb3234d57dcc5fae9c5b836b1620f089e19
font_02_sfnt_off00013631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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