Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad223b6d92b149c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 21:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 051e63fbc2c2e3ce9eea6c9934ce37f6 SHA-1: 64f6985a3b1b90e140bf067a826afab4184dd989 SHA-256: 6ad223b6d92b149cec757e39615ab168eb5ee97132b1bf24b59035ea204e5972
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to compromised WordPress upload directories and other disposable hosting sites. This behavior is characteristic of a link farm used to distribute malicious content or phishing lures. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5d6b9ffcb9248ce0a94a41c3c87b7ae8/86456523914.pdf In PDF document text
    • http://mnwebdesign.dk/userfiles/file/musutipoginuv.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/68251937163.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b74375137bb---bolanebanizazuxi.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2422475e2a---jedevunubefobusako.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021081222550171998.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/82975952989.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/71d056a0dd3ac43c74f5b18e6098bf49/todolejexodunimoxig.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/67262050365.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9932e5bad---57926624986.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/jj45vck2p3ocs9qkch82iocnuj/rukasajezozajow.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077a9bec5430---visozopuw.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/joxoxuwekesikeruzava.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1610856a7a4242---72093668885.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/50429168213.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/fasetupefurivijepowuna.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/15452958792.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/7393865267.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ejcrvpfagh7etqd81fdr01u11n/sopumalaxowugujuzetoso.pdfIn PDF document text
    • http://unseretochter.ch/images/file/75936031874.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/8068811289.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/uojkd3vohpmkjb6mkg9bf4247d/motumetopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=simplification+and+approximation+problems+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_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 11096 bytes
SHA-256: 72e1ae6263d3b66ce42dc7fb8a12c6ecb71d45de69bee9ed70cd4d081920528e
font_02_sfnt_off00010c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 19116 bytes
SHA-256: e18dbc41700b51ca270c6d8d77bf21d3abc5a4cbce6c72dff12bdba3c58464f2

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