Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a6bbd65314f4f7…

MALICIOUS

PDF

87.8 KB Created: 2021-08-10 09:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae66c09a09eda1b1073087c4b8f8df01 SHA-1: dfc3e5e279f42e95cf5171713f7dd46362785e26 SHA-256: e9a6bbd65314f4f793904fa87ade541ed8dd996fa168fb48fc84586dc62ff6c4
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/torejaka.pdf In PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebd92ad38e---90609447613.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/54587072842.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/rasokexudanajuvi.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075773ecd52a---92459991081.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/ravupadasesewufen.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/28669007702.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1900160b2f---pifazejur.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/38055105449.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/76499346675.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/jobumojujofusiketozuril.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/fipera.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/vojizonuloluzire.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/10044089729.pdfIn PDF document text
    • https://egf.tw/test2/images/file/simogegosox.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/68617075302.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/6703982715a97acd59a244fb6e37d327/17685558688.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/56023106376.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/16571007762.pdfIn PDF document text
    • https://aokman-drive.com/d/files/85725949549.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d24ff1aad0---28642833876.pdfIn PDF document text
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/luzaw.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/52751418.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/93196365944.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174f17f5fc---nozuwaxur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=diccionario+pons+aleman+espa%C3%B1ol+pdfPDF 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_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 18620 bytes
SHA-256: 3aaa68ffec88effaf8480be85ae1c8dbd4d36cafaf8e14719823c751165e371c
font_01_sfnt_off00011d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D92 10888 bytes
SHA-256: 696f8dfd435ec4ca938bfc8f46409fe9c41d6c9f768570264da5151c44373ae0
font_02_sfnt_off00013674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1