Malicious PDF — malware analysis report

Static analysis result for SHA-256 11156c3e22f3c118…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 22:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6bf59ae5ba9ce21ead12f9a23bbb6f57 SHA-1: a424044b834a9c703f6568814cd58e7ab36bbb45 SHA-256: 11156c3e22f3c118af6f548a9e1baf14be983b5308d1e6ca89e3e5d4ef94c584
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=gta+5+cheats+ps4+guns+cell+phone PDF link annotation
    • https://ozora.schaffsen.com/contents/file/154889584.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/36493308594.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/fawis.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a88e57fa97d67e946cca5c1f3ff6db32/gazivifatumejazon.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/27918768127.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/vuvanudag.pdfIn PDF document text
    • http://patroha.hu/file/96076044021.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143861b9abf7---23030665429.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613037d78fdd2---rufafevudagudos.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/93699854165.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/zuvumiw.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/74032310657.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/20868027459.pdfIn PDF document text
    • http://jsdarvin.com/files/zakukavudituveli.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/19012529371.pdfIn PDF document text
    • https://xn--q3cceuw0c6ab0d2ii.com/upload_file/files/ripasomojupim.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/bikenaloza.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/62245727396.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109151319137089.pdfIn PDF document text
    • https://wittnebel.dk/file/selisepinizipusewemafos.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35740073966.pdfIn PDF document text
    • https://12shio1.com/contents/files/mejifajivamolopesi.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/85799832430.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/92123405422.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_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 17992 bytes
SHA-256: d71c06abef7818786318be4d0682e96b3bcb822add7fd2a127bd1df436a51552
font_01_sfnt_off000117ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EA 10812 bytes
SHA-256: 62b0d1b95799516b563b976bd851967f0a1a99e0a3bd1199bc86782c21ea2d6d
font_02_sfnt_off000130f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1