Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0034c58fb760745…

MALICIOUS

PDF

94.9 KB Created: 2021-09-03 13:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: addd8f8f020049c7fd35419fcbe77a51 SHA-1: 513f979f21786203eb7eeca214f59cc1d0441e96 SHA-256: a0034c58fb7607454c7a999c14b64ed96475e2f2812b680d8ae8d30e3f810609
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, including those hosted on compromised CMS uploads and disposable hosting, suggest a link farm designed to redirect users to malicious sites. The file's structure and content indicate it is likely part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pistant.ru/uplcv?utm_term=tipos+de+plan+de+negocios+pdf PDF link annotation
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160772f8d627d6---52638654334.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607951941d721---83627974957.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9705dee54---65832442363.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/vobilinoxu.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec13023ad542fa70bdd8c72796656e86/tedanemesugavegibu.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/tojidezoxiniduz.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/zapobaferomunedejekow.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/wezukozeladirelu.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/69937800030.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/iidn802fa3ptesme4it9lsdgmq/21320225485.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/19626293241.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/fifuluseb.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/bodupomig.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/vexinerixesoti.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5718137102.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2a23856e9---nufizowabaguforafalem.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/22643702415.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c47bc0505d0---keberuvenematirazosesaxok.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/34ff70d869d37256c23875bee350772d/14374392838.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/kusejijekavotaxanibew.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/h2pnn80m7sfandclnc8r2ndi5j/zowawupezorepej.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/10025459643.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d611132d7d---37873573517.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e1bff5569aee03874995e3afc36cfbfc/bofenedurigeriboxuga.pdfIn PDF document text
    • 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_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 10560 bytes
SHA-256: d7e0a212ccf3763c1f11c7c5f4a540482d46b1a2d49ac018588c794e39424233
font_02_sfnt_off00013ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA6 20156 bytes
SHA-256: 367f18eeb511006051105dfe2c803f53ddb3c3b14f6ebb623ebdf4e76acbd4c3