Malicious PDF — malware analysis report

Static analysis result for SHA-256 debb2f8953c61fa5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 09:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18e91f8db3bb42f10b7b17fde2182f94 SHA-1: 057a3a6a46751106257b344d9dfe8687a3194651 SHA-256: debb2f8953c61fa578cc20a947a52b218696093513f954cfb5c12334a4c11bdb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a malicious intent, likely phishing or malware distribution, leveraging the embedded links as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f304729191---paxez.pdf In PDF document text
    • http://handinks.com/ckfinder/images_store/files/simisubupawebafu.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/wapoguvopiweburaletes.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/96032317365.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/97544915887.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/egjeoe9kbeokoda5tc2p9nvrg9/72431517446.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/zanexogenijusof.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/56108404192.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94427dee4---xeteriwedag.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/bizukisilowuxunokumafep.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210906_163134.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/purix.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/95326515574.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/nowet.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/gidoturudizoxemiwi.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/sonotoxofeb.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/35600272675.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/sobunixif.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35756246170.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/tomirugu.pdfIn PDF document text
    • http://caythuocnam.org/images/files/gibefigimutugaxemeroni.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/devak.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/kotoruzo.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/54cb32903d1db3ead3b362353654368a/975010352.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/fdg9egp4nvvfrvd66ken6am4nc/ranigerilonazelen.pdfIn PDF document text
    • http://africareview.in/userfiles/file/pafaxafitotemopexawulexem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=android+application+development+architecturePDF 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_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 16876 bytes
SHA-256: c853986b83dc08d6a824c8970f5a96370cc6b65ec089b32076050ea49e5d63b5
font_01_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001201c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201C 10760 bytes
SHA-256: 8c08c03ce78b3154700317801c2082c1098aab763e2882422a2d9baccf9fc3e5

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