Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a10af4618a31f1…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 12:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4fb0a35b76927874011dbe3f91d4cbae SHA-1: 16383775c8b51911ee908daa54b9ed9c6dc77ddd SHA-256: d2a10af4618a31f16091fdf806539f8034317f26d08979f1ff3e1bf7c7239376
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The document contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage. The presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a phishing or redirection attempt, likely to deliver a secondary payload or lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://norilsk.torbay.ru/images/uploads/file/dapapenufakuvuzono.pdf In PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/75450731993.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/dotudujelakuk.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/jizepimetabumeronukosike.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/visemutaxosatalumobelif.pdfIn PDF document text
    • http://orem.mn/uploads/files/20374855762.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/jazup.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/50007616497.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/vemifuwarezivinevusegap.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/wexuwunuxoxijatelubazimud.pdfIn PDF document text
    • https://cet.sk/res/file/rawinedamabekolakar.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/bevizazamunej.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/foredaxawona.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/fenogokagubaloxajunara.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/pizoze.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/fadob.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/36223092262.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/89495528210.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161307e7f7531c---bejavujapujoxeb.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/64285792982.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/07ebf730c6b074cfe96e5261ab06a569/mizulamumerasopafixiw.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/mexaforog.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161408b181687d---tumewawafiguzonukimipusa.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/060329424906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=three+parts+of+stomachPDF 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_off0000c42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42F 10468 bytes
SHA-256: 593e8b1219898194dd751c9b95551df80476a70173ec4dfd6a4c1f38dc9ffe68
font_01_sfnt_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 17772 bytes
SHA-256: 58e08c209a1b5bbaffd9dda1bb1b048f0795f6f7402b67370692902a2a0d69b8
font_02_sfnt_off00010a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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