Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b19892ae18aab55…

MALICIOUS

PDF

86.2 KB Created: 2021-09-14 03:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7169b5b2aee397db5a7f18b4e7b5cd2 SHA-1: 328e58b02327c553525d336a852ff92a2b65c0ae SHA-256: 8b19892ae18aab554f0c25d5e4311c9b569ce9f3d3696c27d2c101a72f0bf4a1
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URLs point to a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b19864c8c8---vajafutezesuza.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161399bd5944a2---69144940192.pdfIn PDF document text
    • https://fivetc.net/uploads/files/tudamaw.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/10852365093.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/munutabivomopavekarunow.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/detufakavaluwawopebikiliz.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/ragomubibuzete.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/61607408635.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/93247819608.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/57932071835.pdfIn PDF document text
    • http://marketingnews.fr/images/file/vomesenobivulukomanamok.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/2c5816da069d38ed5d34feb5a5c2e58a/derurorawetoposolup.pdfIn PDF document text
    • http://idcla.net/upload/files/pobezefabujanavoxoboga.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/82744676645.pdfIn PDF document text
    • http://4darchitecture.org/img/all/lagutaxazov.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/3653972509.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/63537748003.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/168658370.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/68761881748.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132522f4214e---14418207065.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/68588875031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dragon+ball+z+season+1+episode+13PDF 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_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 24536 bytes
SHA-256: 7519d138048d6c2bea6938d85c9f532f8b4b6e073d527b7374bf1ed7691684d1
font_01_sfnt_off00011865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11865 10896 bytes
SHA-256: bce7fb265363353240a701a39477deae233795373a76972714a44ea8673c2f76
font_02_sfnt_off00013152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1