Malicious PDF — malware analysis report

Static analysis result for SHA-256 7561f9c8ad62c91f…

MALICIOUS

PDF

79.4 KB Created: 2021-06-19 10:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5676e9fec78a8d5633e39f1af7324914 SHA-1: ee22645fc6a41b1817985cffd9a5adf80b6fd702 SHA-256: 7561f9c8ad62c91f810123e8595693303297253c2db4ad1955d9239817bf7f66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host and distribute malicious content. The presence of external URIs and the nature of the link farm indicate a likely phishing or malware distribution attempt, potentially via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6dec21ef4---64919776069.pdf In PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f5c6e6fae78cf9667cb45b7c9ff9430e/33682045716.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96fa6b686---96083856852.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdeb73f1de---54562632315.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/89363634895.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608499dcd3494---rezivubidijugig.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793ec23073b---64473239121.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/cf39d8283443f4502c2dc1656e181650/dafurodopopenuvezasafe.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092676c8a138---tejapufumivaja.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/1i2kgm8l5mq4bg2o5a71pkll72/54563709043.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5774d22c---3964522435.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/zamewisekusif.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c088d025550---48662019768.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16070872c41196---vudodetan.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5049a9502---29969944539.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/56862355908.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8da1e896a---39885382259.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=p5r+twins+confidantPDF 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://scripts.sil.org/OFLIn 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_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 5200 bytes
SHA-256: 4205234022c2cb1de383816e8c55d9129abdc4d973b9702991625457f2b57570
font_01_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 10868 bytes
SHA-256: 3b4e3a4cdbb7277b13e5c8f0ae83517279c74cb41bc953fc90cede8ded609fb9
font_02_sfnt_off00011b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B15 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3

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