Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81a0ff24832e6d7…

MALICIOUS

PDF

107.3 KB Created: 2021-07-27 09:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a7187b83845ca62d1ec7fd77d6a14459 SHA-1: 60fc8ae308e9d1ca639103e4374192e81f599d66 SHA-256: c81a0ff24832e6d793b74a54bc12ea770c5fc3ca0dee8192e9e06aff5af00c10
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the heuristics indicate a focus on hosting numerous links on potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4415f6a731---gurerurivuput.pdf In PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/togojapimosubijuvufo.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/a3c915f4cffe179fc266910f49d9fe5e/63593709989.pdfIn PDF document text
    • https://noddy.nu/images/file/68202736897.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e718aab5b2b---zufekajedakuvitekize.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/49013726760a0d3d344c1b.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210703164407.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/fb756328009b40449697a833f830740e/furovotidalesubaxepazejaj.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1b140d252b7c2079cd643997c8ccf846/38420788704.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/gm2gtqjomtrtibturefbgbqrnv/sumubojunuxa.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe040bcfa4---munigibukebuzose.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/sedetiwunebipetu.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/41178763516.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/86843619858.pdfIn PDF document text
    • https://amblamy.ee/upload/file/famiteno.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f3f1aaa95f8acf866349a388a336465a/pamoxe.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/35391899140.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/510f4d2c8fe1b8a9ec7104284823b707/42883987051.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/xutimulixubukijikibelepa.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/674cfac8ec9d40f2b1f04f8a30715006/xubekoxedagaletarig.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/45379624492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tipos+de+propagacion+vegetativa+artificialPDF 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_off00013ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD5 19440 bytes
SHA-256: 69ed2e070a936f79c8c8b74eb1e390069e3299803f926795514af9155e320509
font_01_sfnt_off00016bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD6 10824 bytes
SHA-256: adcf0710b5c1bef82cb4b776dc8c1ff9a70ae0153af90b7fb0374f90a3d4eb3f
font_02_sfnt_off000184c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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