Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7dc229c6c0af4b7…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 19:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8549d8004f119179d7d6d204b4312f08 SHA-1: d8015ae5e39e9fe4943a2c7353d70ea3088a0cb8 SHA-256: e7dc229c6c0af4b7a76c66029b396ee1a647d9da8d6d5cf5fb3969eff90630d0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users to potentially malicious content. The presence of these links and the overall structure suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://infrive.ru/uplcv?utm_term=import+sqlite+database+to+android PDF link annotation
    • http://thebankcardservice.com/uploads/files/48966275172.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/pifepukibomi.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/semivoniveridesimipaxiga.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090211514573499.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161334a4cbf5fa---86031392174.pdfIn PDF document text
    • http://ippon.lv/uploads/File/gunewuled.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/mj9kvtauua5fau0rn2pf7ccs4s/13459989277.pdfIn PDF document text
    • http://amdind.com/userfiles/file/86943324677.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d5a62f5f5---60032569897.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/18074806847.pdfIn PDF document text
    • https://citytrafik.nu/images/file/tumejamojuzidebilu.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/56242749617.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/fisijasidaridopezijag.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f480d04b0b---dugikis.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/konujesavilowawosanazuzul.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/89763015215.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/pudusenivarimatikotamiw.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/navevedexugajubineg.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/siguzevalowiro.pdfIn PDF document text
    • https://online-wums.com/files/files/gizesitixivew.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/84055577396.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_off0000b98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A1 17036 bytes
SHA-256: 79d028b7ecef3533383822c07268b041514b97b48f250e8a1af4e1771570c554
font_02_sfnt_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 10788 bytes
SHA-256: 581e086d6b0e41cd2cd2068d89eaaa1030655c838cab392528cccc9b9bb2d0f2