Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2250dc8216cd464…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 05:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 191f2e95499bbd454e05a3474ab2941a SHA-1: dd02041421bdbf25b418e8cd7fb521aea8041b86 SHA-256: c2250dc8216cd4640dc32cc271ed3510d46943596fc18e87137a65a4abcc6b96
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Several heuristics indicate that the PDF is part of a link farm hosted on potentially compromised or disposable domains, suggesting an attempt to obscure the true destination or evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mikailang.com/userfiles/file/20210812153445_1507079933.pdf In PDF document text
    • http://tks-forever.com/upload/2021/07/10/file/meniguwul.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/5uephr9dfmfo0jl5bbr9j3upn1/diwiv.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/tebewuvozodopo.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/40771724251.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/86437883068.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b8c06eabf---35994859673.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/88693304816.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/18179525257.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1155f51d---juwuwabijuvobuta.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160858f16a3bb8---53617471244.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab37c60dcb---1940613352.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120d2b0629a0---kugirida.pdfIn PDF document text
    • http://wohntraumgmbh.at/42787595871.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/4705854768.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/58389810225.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/28145847052.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/4851261717.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/meponufofujogebovovudezi.pdfIn PDF document text
    • http://medi-sen.com/files/files/6570290837.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/5826d6235e0a8d7e7fc2cfc2ad4197b9/wopeleberufadoj.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/bizide.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/64007444872.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6098e57ca---difipumifebenulopalib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=coded+inequality+pdf+downloadPDF 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_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 19552 bytes
SHA-256: 5499776b78b4a21c38530c193b0141ae1686f729bd7d5025328936d16913234d
font_01_sfnt_off00010faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAF 10700 bytes
SHA-256: 56ceff9d3826962666e67e798fc119ff77a01eef29b61f17761bb83cc1b563c5
font_02_sfnt_off00012834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1