Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b61201657069974…

MALICIOUS

PDF

77.7 KB Created: 2021-09-05 16:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2363b75a09f8e7f6ae4422dc3cff2a32 SHA-1: 9726c2eaa745a8d9a598bf771c0fe63f5c0ed4b4 SHA-256: 7b6120165706997429ce1cf7f4f5c61c45891449f5fc2b0fdd79ee4986e0701f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also features a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads or exploiting vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/lm1hhp7utmttgl0lgctud1us1g/pozogigivijofedejidonax.pdf In PDF document text
    • http://jinanxintiandi.com/userfiles/files/47209765123.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/simalex.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608223e6b1469---51082353913.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/36197483234.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qrhhp3njqb52i7frn4f5hsmp1p/sipigakutedobotekuwipidug.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/70240651321.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b412c300378---53639611294.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f483e8d37457001b976528415bc9aefb/62916889914.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/89162829223.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/97869977139.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/51311052611.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/6375104040.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/27718207441.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/87838791814.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/mifabix.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/32363146200.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc209124b68---kisikafobud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=aprilaire+700a+humidifier+installation+manualPDF 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_off0000c952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC952 17976 bytes
SHA-256: 8bdf15b919de8ba6bf30ba525acf48c4cff80e053d934bc6842e49e09a58da7a
font_01_sfnt_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 11016 bytes
SHA-256: 8380e547ccd301813749d255ddc43483b67d40b55d9e64988512160fb964f373
font_02_sfnt_off0001117d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1