Malicious PDF — malware analysis report

Static analysis result for SHA-256 066438f1de294d8b…

MALICIOUS

PDF

69.2 KB Created: 2021-09-04 23:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 00b6b9eddef0358f6cebe4b6487e85ea SHA-1: 87da2346c69795c5bfa841b12b8da7ffea8e0cf5 SHA-256: 066438f1de294d8b6cafcd12adc39f3296c463fa59a4d7c152a93e8aaf3d6f1f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-only content, and the presence of numerous external links, many pointing to compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://short-story.ru/upload/file/sijig.pdf In PDF document text
    • http://cokhibaosang.com/media/ftp/file/20229981424.pdfIn PDF document text
    • http://farmina.ru/uploads/files/xazofojovujudoliletobij.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/xemusaroxodezab.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e846e742d65---goloxinelejume.pdfIn PDF document text
    • http://glttek.com/userfiles/file/31224993863.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/jadalefomitavejozif.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffdb4b6aa1---zupulede.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ub16llpjft7hjmb1umqjjbjqi7/10328440054.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1b87d605---26202216476.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/71cb35ccf52ac591e32dac51a352922d/matowipezuravuledurelar.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/odaaki8ksps25o9cntg2l8mpps/sibifexeviweg.pdfIn PDF document text
    • http://metallpress.ru/files/kovovujamosazobupoxisuro.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/68250436095.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/gibatamutodigizefogesemup.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/aefa4968aab46e2e541d286296a9c1db/sonafu.pdfIn PDF document text
    • http://servmed.net/userfiles/file/fapemidojorikixeremamegas.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/39870179603.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/nokojido.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc1cf70b45---73143979067.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/it6893qbuihs8686bd1of5fpe0/39874037150.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608309232f3d1---5598708258.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106812ccd3f5---72406562151.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/42825522595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=lower+cross+syndrome+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_off0000b4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 13920 bytes
SHA-256: 9fcc9c492be0f9b88353ed7d563db7604664442d0044cc105063b509a08de4ab
font_02_sfnt_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 10540 bytes
SHA-256: fcf7cab84aca4ba3031af30274f35b6e1f940f6dafad17a3c4c7b8799f72f605

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