Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f5c54f13e4e948…

MALICIOUS

PDF

85.1 KB Created: 2021-09-15 23:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7394e2ae4a9cbbd1bbaf33549b208111 SHA-1: 25bdd7244ca032f6953ade11eae9c402825ff17a SHA-256: a9f5c54f13e4e9480017a71f6bc59da4d48b8fc6f5ac2c32ba4189113fc36b9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV/ML detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://incomingmakedonia.com/files/files/vowamukaz.pdf In PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141f21aa9b11---tobeterawefa.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/54334856565.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/vemuborosojugamak.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/nijirisaxosodugobalu.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/lilejenim.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/87209193040.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/gajinibapeboledudas.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135902a0aca2---38749885422.pdfIn PDF document text
    • https://rajakedua.com/contents/files/80641861846.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/79697975571.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/66037984744.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/98708861497.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/devafatoruj.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/92124277764.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/tinesomigevewewosezuv.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/4jv4cahvmldgqqvk8clg6762aq/46755408240.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53b44bfe2---kikaremotojudopum.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/bidunebevaj.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/depuped.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/73322116921.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/42332848687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+phone+proximity+sensorPDF 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_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 10648 bytes
SHA-256: a0df8581012c4cfba01db1f05d93db8e1df89d8b851889ff462572f8ec7e6c4e
font_01_sfnt_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 17620 bytes
SHA-256: de477c7fbb7d989d4f8eac25257a77428586fb3c154998ba8fdb5b3732e20794
font_02_sfnt_off00012ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1