Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e2305506d60e5e5…

MALICIOUS

PDF

69.6 KB Created: 2021-09-23 22:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1844511f7c9452010ac73c26c5609224 SHA-1: 66b147aef5917a8198ff41835ac5387aa7a37169 SHA-256: 9e2305506d60e5e5b40f5dec7755f7f1503abcd2b21600e985f1e98367db2272
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting. These findings suggest the document's primary purpose is to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450802a19b5---91592912367.pdf In PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/931f24534adb202d9952b663ed686c25/96462309887.pdfIn PDF document text
    • http://exima.kr/userData/board/file/wifenijokokosebekepumel.pdfIn PDF document text
    • http://4yoga.by/pics/files/komefofebudas.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/63139415681.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/taxumejidimokizudilubikot.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/towaf.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/94371845332.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/33377972470.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140118bedf3d---luwosaranifefaza.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/142834723613cd27c830f9.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b36c087757---98521785514.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/37419938733.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/78340601627.pdfIn PDF document text
    • http://dsagco.com/Upload/file/54369839593.pdfIn PDF document text
    • http://kgmda.com/upload/files/weruwadigidudowax.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/viduxufifewazixi.pdfIn PDF document text
    • http://chinahongji.com/d/files/34432177500.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/kolulexawakuxebub.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/dofeja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=t+mobile+phone+settingsPDF 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_off0000b0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E4 16156 bytes
SHA-256: bb43b609b248ce45c639de2e73f06f7cbf67930ab6dfbcf38e632aca4db68347
font_01_sfnt_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 10540 bytes
SHA-256: 5c857e508b5f34b7b4ef6c0e3f5b7001f63e5007a19af5d85ee7b2da6a16ad74
font_02_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1