Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c3197ce271923a…

MALICIOUS

PDF

84.0 KB Created: 2021-08-19 03:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e3c9bbd5598755abd6aabad7ed69085e SHA-1: d28ba6baf5e2aa3fbbadbc8204a34d2297f8dd35 SHA-256: e3c3197ce271923a2f347a5e7cd61f6ceede1c191ea0662282d6c48614eeb745
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect the user to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/crkbsn5b0lo7shof2qc43gogqr/nefevuxefekatavanitepila.pdf In PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/riord5dbauamljkpd4omsaj70h/60069382432.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/86714757469.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5637ea4d46---96512621492.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/84ed08cbb699d25787a6d245083509a0/bafisojisuxajajexeteba.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/salifomu.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/dixubati.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ql4an8t4guemjt04t669scjctc/36379854976.pdfIn PDF document text
    • https://yuss.it/file/kuxupedodaguwe.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c2d647dbc---20801933330.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/66362699468.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d028e3c4c3---tabenasisetubumuxidutes.pdfIn PDF document text
    • http://stadiumhighschoolclassof1965.com/clients/0/00/0080f9a3d0f10e930bcfc39f0a940e94/File/zifujimezarinivuli.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/joxumixeluxivi.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/gevenevoregav.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f209f6426a---vafatozimanureg.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/91336841617.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907b7720c82---67307181447.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/kewuviw.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/34b0457e4a055225dcbad72c794e2ea1/90456286923.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/04a685dd385c31b371abc1e74737d37c/dipebazu.pdfIn PDF document text
    • http://suecoop.com/UserFiles/file/43953501460.pdfIn PDF document text
    • http://altinay-law.com/images/file/40625538871.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/revagemoxinapuvuzem.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/20458395592.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/62970877757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=harry+potter+half+blood+prince+full+movie+google+drivePDF 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_off0000e0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 17416 bytes
SHA-256: 263adf79211448ed5d9375c4900068ef5f2a25c14231ae2420a1fd60de1f582c
font_02_sfnt_off00012650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 11312 bytes
SHA-256: 0f703e3bb11b189b18833cabf290867967f82d0e1008931027bda5132eb77be6