Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73b39ba02d17f5f…

MALICIOUS

PDF

78.8 KB Created: 2021-09-15 06:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f2b90c4b5b62bfdcdb72494dd989f05d SHA-1: b5664f75e9015d1555c2c3bf348c9224ba451ed6 SHA-256: c73b39ba02d17f5fdf1af3e11b3eedbc5306f0aaf877cec74bd8894874969ed3
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 a phishing trojan. The document contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. One URL, 'https://irlanc.ru/uplcv?utm_term=download+gta+5+online+apk+pc', indicates a lure related to downloading software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=download+gta+5+online+apk+pc PDF link annotation
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/siniribegadaxonoxafipofa.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/wifivuwirekevobogodafela.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/welovifor.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/laxuxaragov.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/bokigan.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/23500665304.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141111367a63---kunosizexizowib.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161349469d8437---59880979.pdfIn PDF document text
    • http://hla.vn/upload/files/64791179318.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b39a08c3f---20069197574.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/81998023781.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/xejusekuritawovumeruwakez.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b2c211a4d909b67aaf6d5193f48a3fd8/39677683887.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/39228849280.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614119e74aa9b---fivusefog.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/jidujugirupetudosiwupe.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/28b1f4b9235c0fe2c7d1603bd2d21524/wujamisuzinixurasoxomideb.pdfIn PDF document text
    • https://cncunse.com/d/files/29029327253.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/83233924733.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/wevidamizutukadosil.pdfIn PDF document text
    • http://placc.info/up_image/60992523487.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/susete.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/gulugevu.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/xifuf.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_off0000cf72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF72 10732 bytes
SHA-256: 21ec00d0b0f153405402f952d12927f2fef6745f44dbd63ae5f5dc240eb84ec2
font_01_sfnt_off0000e81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 17624 bytes
SHA-256: 00ace5603a5c057730979a5007810a667a16f96ce95c5bdf706717a18bf8796b