Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fa4c7a6a494f11…

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 08:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a3f40b954a31b1da6769fba1805be113 SHA-1: 222106594895b33942183a331aeeb18d655329a9 SHA-256: b6fa4c7a6a494f11f3efd055ddfdf0c93774d5133c9662b22841f6e5b488ae93
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://whatshoulditcostme.com/userfiles/file/mumegaj.pdf In PDF document text
    • http://katachizu.com/img/news/files/bakapupikoxabadirem.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfeadf1a35---29097469600.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/nabolobivukofarozizajukes.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/58160741161124ceaca9dc.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083361a29563---gumixulujovuwobebuzo.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/73183031620.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/82492719387.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc2eb62e0---roware.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/gipedolakoxu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/43415159230.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/25395703277.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/kinixurerojope.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/54649957038.pdfIn PDF document text
    • https://fishuntpesca.it/file/27542647852.pdfIn PDF document text
    • http://getem.pl/files/file/47935722667.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/44301786498.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/11090795241.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/tojokaderofevunusinekakim.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dcb2c616a---pekesok.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gokowubedaduzedutoraj.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160849acc366b0---8453270090.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/65260871556.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/cf5fd83bfd8995ae247a33c3d297fa1f/vupamo.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/gepivurudilawex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=energylandia+mapa+parku+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_off0000c0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C1 10744 bytes
SHA-256: 313a1e3e9265cffdd08cf1f4f7ddb27dbdfaf32d49b453a8a2685ac237047ed4
font_01_sfnt_off0000d921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD921 17316 bytes
SHA-256: 9858aa0922f763687a51bae36fe426aac89b59be06ea5fdf0e0e4c712eafa056
font_02_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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