Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3c313d652c1964…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 02:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 66545e7582e0846e1c658bf06776d5e2 SHA-1: 199aef6211198b96aa553945ecec36e2f9f1651c SHA-256: da3c313d652c196459425e2d73339a8b4b005ef616f03a34dd50b9ed61c93dae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jjmcp.jp/userfiles/Image/file/bobijumidunonigipe.pdf In PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cba8fbc201---dasirok.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/87595204934.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050703104773499.pdfIn PDF document text
    • http://kelvista.lt/images/files/95054654200.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760dbcbce49---76928427721.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/51157196583.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/535ca51a4fcc6c9431bf02b4e03dbbbe/86835944575.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/26933581020.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/74244420327.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/d3fc2f9579b4664967c4323f8da29f8f/44209135896.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4aa66384b2e50bf9b2404c1d6b0bd536/8744547453.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c14fa3aa3d46adf038c6db9486c0be37/91605963757.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210808042458.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/71006334604.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/sivifapevadi.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/12151619341.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/50779696b5db4766b423a44aaca3688a/sotorax.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab09bc7b1---9454235048.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/90966021832.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c35e3c314---88263666135.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/6ecddd30488f9a791b0bcbcd53e0892e/16472091562.pdfIn PDF document text
    • http://envigest.cz/upload/file/jabupubu.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/25814e6f25e769636796d6e312b3481b/83553299378.pdfIn PDF document text
    • http://taxfreepoint.com/file/38291357862.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/62683999226.pdfIn PDF document text
    • http://huntland.hu/upload/file/61962777065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=critical+thinking+reading+and+writing+barnet+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_off0000bdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCF 15796 bytes
SHA-256: 2a4f8671d6eca2e68c496fc173292f62569e603985d33726c8c869152f25d3f0
font_01_sfnt_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 10960 bytes
SHA-256: 9db0cadaa77922a582a4729a2bbfd15acc40d817bf296f380e8ad5081858a90a
font_02_sfnt_off0000ff26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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