Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f2f1cfebb59e25…

MALICIOUS

PDF

86.7 KB Created: 2021-09-07 11:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 76543bdf94aafec55a0ba60a287eb35d SHA-1: 6676ea911725cda9edb0335b1b14a76f997e5808 SHA-256: 94f2f1cfebb59e25618df6ca089f412a2c24e6a146693ee47ed77a734d497f38
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links suggests an attempt to redirect users to malicious sites for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://monkey-do.net/userfiles/file/87241110080.pdf In PDF document text
    • https://maydangson.com/vietkiendo/upload/file/60723381236.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/439225fe04b1193c7a7a4fb9e9fee771/lenabuset.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/pofibaxiwalezawuwozudaf.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e223062f2---nitasub.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e244818e9ff---34634634830.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc9f14e9d---muzefesoxalinibufaz.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/57808482845.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/97204194854.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161099dfa64014---tufekutirinakubezaseko.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/lhmns40tkq5jtkctqrj4q67hs5/dofapedabanusawadokuziw.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/26384915024.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/fesilojurotebami.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/84011209364.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/59247936693.pdfIn PDF document text
    • http://texmet.pl/userimages/file/kuwowub.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/35806204718.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0d479e0129dd8b82f3dede46e1bbeae3/dekefuluxaziw.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860600a2f73---wojuzefirumegumaf.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/susimolikopaduresapemawib.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/5293275ee48be937ac6ca8508d124d17/mixew.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/13335679876.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/sepovuwevomisok.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/bozikavakijepoxesefob.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa628d9d995---26348508302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dieta+para+cuidar+los+ri%C3%B1ones+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_off0000e8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 10920 bytes
SHA-256: 2a5e98d9540de3577007101eac2646c26ebe7a6664174be107d1dfd8e0c06c92
font_01_sfnt_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 19080 bytes
SHA-256: e20191e4ed6aa8582912685eecc785510abf9a5b64f5e5546a7a6b37979623c3
font_02_sfnt_off000132c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1