Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbed5dfae7ddabee…

MALICIOUS

PDF

79.5 KB Created: 2021-09-11 17:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45e0465223d7a61e67794bcdae02e187 SHA-1: 0ee448366b26852518cf96b5fecaa88d147e9e04 SHA-256: dbed5dfae7ddabee8846a7dd98929117cb4a03bbc4c7232a00eb9938ceab9bb9
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links indicate an attempt to lead users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://shengnabei.com/uploadfile/file///2021090910260033.pdf In PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/05335bae9c9b8292c322d6ca7b482fc1/81682050678.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/ferimepixufukusalok.pdfIn PDF document text
    • http://travellerisland.com/files/ponev.pdfIn PDF document text
    • http://chinalabware.es/d/files/77107070844.pdfIn PDF document text
    • https://funke.be/data/file/70851988067.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210901/files/20210901080609.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/46093153315.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/neponadelogonagov.pdfIn PDF document text
    • http://tid.vn/upload/files/doxuziwekivivipoxib.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/jurujakugopidonibol.pdfIn PDF document text
    • http://teraval.cz/res/file/rogitev.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109011637168316.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/45456371452.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/rupaxenuvagutiwibo.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b63f9c67f2---guzozedewakenogimabage.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/soges.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210901081757803.pdfIn PDF document text
    • http://gdgom.com/upload/file/210907150359342841no5dy3cs0n6k.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210909032215.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/21301717301.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/15670707649.pdfIn PDF document text
    • http://17njl.com/userfiles/files/woxudunidubatiwa.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/18371209314.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/99365907818.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/71438032311.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7becbb44435fbfd8dcbeaaafb06f25b3/jurazima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=can+we+remotely+access+android+phonePDF 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_off0000d150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 11008 bytes
SHA-256: 8ff4f3d114b661a1fa7ca0fdfccfa157a33c74bf5dd47a7760978c59a80422e9
font_02_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 17412 bytes
SHA-256: a1ab72d7330709c083624a6286ca1dfbe00e508b959fe92429be3c1749d3fbd5