Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b6215ba0ca8b07…

MALICIOUS

PDF

90.1 KB Created: 2021-07-02 12:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 64a3cd0e3361373bf92c632da6ffe8cd SHA-1: ba6981c7686573051bd7d95f78781d87d5604031 SHA-256: 78b6215ba0ca8b0788d4006693d8a361d3c483eb9d7acc0e0b1e1ebba0b1d914
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URLs and link farm structure suggest an attempt to lure users to malicious sites, likely as a first stage of a broader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hometeamcorp.com/images/usr/35330120324.pdf In PDF document text
    • http://xahscw.com/userfiles/file/kapobovetuzaxosejara.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28415af34---43896594771.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e93680724d---7238688008.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b730d43c325---magefavanowabom.pdfIn PDF document text
    • http://imaginove.eu/data/Files/zatojijolad.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/pulesejuvifawoto.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f5f96b364---54180998661.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/addd5d880c1b2315aef66650b84cd593/gugabaxiradadedogumi.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc618661cd---sixivo.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd161ce5dc---65977445290.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/82723557401.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/5133439967.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93a0b25951---62348807592.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c99a072e6---susetugividarafanonis.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d35419e89---9413748205.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/97775452316.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/qj2g4tdd2j7nkvcn72qct8r8h6/zeforokose.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/ramit.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/f0jpp33eariv54vqco5rc0p7a3/xexeforilariraduduxokes.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/wofebisujofebab.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/2aef67a7573c27cfcfb99ba02839671a/68149144975.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/wefofud.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/46750048097.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/ae96be28bc404ab8f4a59f547e08ac55/gerafetewixifolaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+photo+lab+picture+editor+face+effects+art+framesPDF 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_off0000fb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001138d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138D 11212 bytes
SHA-256: 275de5c0e1186e8ec9ef06edc13f92de41323a77736c972dfb3ef9d5526bd837
font_02_sfnt_off00012d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6A 17252 bytes
SHA-256: 64161d2520d82715fc3e68a6db8009a3fa11d9dd85fd7ee51390a4f697c1433a