Malicious PDF — malware analysis report

Static analysis result for SHA-256 7407916d0dad75e4…

MALICIOUS

PDF

84.2 KB Created: 2021-09-22 10:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a678726ae29d5ebd10d5e9f1e73faa5a SHA-1: fbbc3c00d7195499fb2ff9c3bb5fae5b2a590a1c SHA-256: 7407916d0dad75e45d6d0e6c43ca82de8905d9f6a0112ef53f53e8a3d77810ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document used as a lure.

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 http://szyuangang.com/UserFiles/file///kavazile.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/9ffa17d0356192fdba81022e34340e39/wizulegoma.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/fugototowus.pdfIn PDF document text
    • http://nut-shell.net/upload/files/lomufexokomoxabifuj.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/71253807882.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/wuwironojufamiduroji.pdfIn PDF document text
    • https://actorconseil.com/files/file/lawekijovi.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/darofopofewidelopo.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/15571818235.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/71037749845.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091607042586.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/dezegixekuxixosefudako.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/54830571229.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6a411620e61232690eb987b669f82b4b/moxalaruk.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/92021198623.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/watesubowe.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613013146d20c---7597140543.pdfIn PDF document text
    • http://electric-kernbichler.at/vigoxuwuxiwuwowatipu.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/donuva.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/zozogelelupijepug.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/9834897404.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf39461af---luvixodapuxarunagex.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/gutuneloxido.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/leragoxuvitoget.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/nujoxizetojodesatapupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+story+of+late+night+watch+onlinePDF 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_off0000e2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B2 10780 bytes
SHA-256: dc4348e0658a4098d35cbd7deb0eda6cbed4bb406a896024ab9b3ce263e3f97e
font_01_sfnt_off0000fb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B1 18168 bytes
SHA-256: acbdc3b4e56034fe83e50c69e886b5d377e6a72466f0c44d2dd19f9974413171

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