Malicious PDF — malware analysis report

Static analysis result for SHA-256 9347f5b5c6ee5676…

MALICIOUS

PDF

82.7 KB Created: 2021-09-24 10:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a72a8f33af4c93f67492c5a07a1e3859 SHA-1: c708d1ff670a825bd4bbcfb208758e23c55c97d9 SHA-256: 9347f5b5c6ee56765241c7e632d11db05cf5195e6eec10f79c6d53d82c69b03e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to distribute malicious files. The presence of embedded URLs and the nature of the heuristics indicate an attempt to trick users into downloading further malware, likely through a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.accessibilite-salle-eau.com/ckfinder/userfiles/files/pazokufad.pdf In PDF document text
    • http://autothudo.vn/upload/fck/file/93587473133.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614090f23da0a---bumevunemederajimolere.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/morewitegevafij.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/levogipefutetumipe.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/43975872624.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b26b72da6f---74740779686.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16147a5131c73f---zupulalosuv.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/16104633041.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/fesaniwulibijilimom.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109091912081981.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/51786012091.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133ca818f7d0---55932590312.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/lutijenebuja.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/61494130510.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/96064393698.pdfIn PDF document text
    • https://abcspain.tansis.com/userfiles/file/suxujofadupufowolet.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133ca761e463---mavonejipedaxejidoge.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/segowotosufavelorad.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/konejidazorog.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/80756648669.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/dapozeradonokujuboj.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/85774304656.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/21363311230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+sims+4+pc+apkPDF 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_off0000e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 17364 bytes
SHA-256: 0b1647734837cc7403daa25b9d07513b43378aa5c72202c2645b84cdc39df327
font_01_sfnt_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001262c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262C 10304 bytes
SHA-256: 6e4b2afecc8ba9479721bbfafb6dd3b1afe6a7bbcbb3bb50c162cb1eb6cf1ba2