Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7baca23292b9b5d…

MALICIOUS

PDF

85.4 KB Created: 2021-06-27 10:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d6e37e78cc4c176f7af04f1b448d7737 SHA-1: a7d0e46944120863e3ce3de0afb81f2821c2bb72 SHA-256: d7baca23292b9b5db4643367c5689d088f22fb684b76561b8014afa222ce2067
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://crysiq.ru/uplcv?utm_term=emulator+for+low+pc PDF link annotation
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160714a1e0c212---nujoxadala.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/xevizemodib.pdfIn PDF document text
    • http://poorclarescork.ie/images/13207631879.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/1c5c49853cd6410949d49783fd65a878/35030139606.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/xeluwevuxakajovasalawafuf.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/vopuvurexonabidiruvilo.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/16857803066.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/dujesuratuvekesupege.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a831a893cbf---69079098854.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160869db4e730e---gigodukadizujaxekanod.pdfIn PDF document text
    • https://airshow-bg.com/file/soloremujatojidobebep.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f95fc934d9---bomukidarizosaguvado.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081cc0e4f0e9---21009723437.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9495f74e91---falowikoronira.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/kuxafitizolopovito.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/41060315954.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1327f941---vasutemor.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08347c71f2---84700370772.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/783ida1mgr1hnevmvp2nj0qhn8/fikageluwozexiwuxa.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6aabeef0f---lesobi.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/90765927208.pdfIn PDF document text
    • http://yuha.be/_files/file/jemuvunasujupolanegefum.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e405229f2---dixuwepogeri.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847684ebc15---kuxuf.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/72013872559.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/9a30f338146cfb99cdfd49586afac44a/73175658058.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_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 10316 bytes
SHA-256: 109b7a9d61a34461ace1d1d448a674493b80b5da25e63c9a0b31c327593d2a6d
font_02_sfnt_off00011b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6F 16780 bytes
SHA-256: 1dad0dac438ba73ea35dea2fd26bb421cdf8b334d961e67f328715065e03c589