Malicious PDF — malware analysis report

Static analysis result for SHA-256 344a461155985a23…

MALICIOUS

PDF

92.2 KB Created: 2021-08-19 00:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c21b856fedc6496efc3348469a230751 SHA-1: e2be0822f60c6e2ae293b3ad189a87d3de1e1463 SHA-256: 344a461155985a2318214fe0c1895e114daee1079e7e0628a1784eb416c28355
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of link farms is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://aven.su/userfiles/file/72283674560.pdf In PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/losisolinibubux.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/28077177227.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/84430007642.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f099a07a5---36457197765.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/o2bdrbkmejmh7if2i438d5ne7s/ladafofile.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/sogisawekufigonat.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/75623719985.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/52453217d8b06853e68f5851d549e187/29239924830.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/79131983058.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/puzedop.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/luziwobozijelutadugi.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/53604117370.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/88904509533.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae52efab1d2---29750671502.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/43134463982.pdfIn PDF document text
    • https://coatielectronica.com/files/64328955605.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/busijepekovafemiw.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a72d92a5842---99376264886.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ccd85c011---17287402840.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/nirabunafipajafirutenamiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=frozen+2+cast+charactersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 10348 bytes
SHA-256: 24f7d5e8bc1231da2578d37615da06e8315f7babc06b4ffd00924431c33ad0a6
font_02_sfnt_off00011e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E12 16232 bytes
SHA-256: b646e4e99f19ac05519abaf59ecb91311bfd919e7d59cfb2ca623a477a188405
font_03_sfnt_off00013395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13395 17324 bytes
SHA-256: 85937d03a91c1b04f7bfeabb63cbd9f3c9481ab667d85b35d5398633ca86bfb6

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