Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b88818838abb77…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 17:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8fa96c78a41e38bf458f773439b510e SHA-1: 7e0692e5e3e8c2c4412dc00c080f9b1d096e0822 SHA-256: 93b88818838abb77f5fcb8173736656b32d4a210c1e5afe109671ee9799d4ced
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://cs-golfclub.com/ckupload/files/68515236212.pdf In PDF document text
    • http://saiprogetti.net/userfiles/files/wanitujozupodezetapeko.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/32164226989.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/dedareluvafuwomobe.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/pupogazadevanogikaki.pdfIn PDF document text
    • https://wsbtitan.com/images/file/26409599614.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b9c6bd461507db866275b1d29adcfddc/fajidovanabatut.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/47651206117.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/20316045286.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/5821218281.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/kuwanufaberaf.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/posemifazipupipituxokof.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///46228574474.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/gulogipitolumi.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/62162947127.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e81818b0d1c284f786f921dd61451329/56502621932.pdfIn PDF document text
    • http://cosyromania.com/media/file/48259139278.pdfIn PDF document text
    • https://nls.vn/upload/files/wusowofa.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/53678128880.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/kifinuvaf.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/67253559973.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/xarosaxab.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/zokedenuvuxedupo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140247b38bf7---xasifarumegigin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+free+food+in+dragon+cityPDF 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_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 18936 bytes
SHA-256: ac1c7e238335111a8f766fb07bca5012fd6f0bb5035bdc33f0cbcce0983f0406
font_01_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 10628 bytes
SHA-256: 890691034d326861b55be0804c8b760146b2ad426737456043322be8075e2e3c
font_02_sfnt_off000121eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1