Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec27ad66d6744077…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 00:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6135f0d30fa5db186a41f1de2f0b7911 SHA-1: f279cb0e2febb66ee490d89a88295f46a667d9c2 SHA-256: ec27ad66d6744077e15b97f2ed9a53a7ee4b57ec52e80ee9408f188e7821d1d4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself is also noted for having duplicate object bodies, which can be used to obscure malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://quaretti.it/userfiles/files/demulojetemoxita.pdf In PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kosisalujajetovajuw.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/warupowebomodigumozok.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/48630995984.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a45acc15071---52189558102.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba74de54e7a---775639527.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160915392877c9---69101312462.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45fa12ee1---ladegukugasederufebe.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb448f15b91---36891877484.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/78383811517.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160708733ee7a8---44783321694.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202162815078974.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/cdcab9903b73189939cabdbcc661c4bd/wariwifewimofita.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/ridakavanuvogekofanexa.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/5f32a397abed73a2b37cd9229345abfd/14338732797.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102f2b825a35---zufavizapalefusen.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/98777613925.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/61496724814.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/c4epk2ko6uok723tnr85i0hujv/46930503081.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/27332f03ade98bc1f878c3a1cc62e470/83183276005.pdfIn PDF document text
    • http://accronline.com/userfiles/file/9659560639.pdfIn PDF document text
    • http://dobermanncz.eu/files/17778551907.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c3be406a18ea015f617ff04ddb7983fd/20059654300.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/73353498411.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bf02abe7ea9f90aee7b4c31dae4d5a4/59054327823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=los+derechos+de+la+mujer+en+el+islam+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_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 10972 bytes
SHA-256: 194c4d3984a2962c23abded83cb67fd7fbdaf1c5e87a84ac5390857d82c93a15
font_01_sfnt_off0000e114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 17744 bytes
SHA-256: 23f61b6a1000a0395e7261df5de802da2449733ab1eaf35e83f4262baa7bd58a

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