Malicious PDF — malware analysis report

Static analysis result for SHA-256 10db4d864fd55bfc…

MALICIOUS

PDF

73.3 KB Created: 2021-09-08 23:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9e3ea84aadee44c018e7f51734b20750 SHA-1: afa7300f7f49e5bf09c2f6f4480147f5f27e9a75 SHA-256: 10db4d864fd55bfcb5d6e929ee6111820c3f728c9fbd99843e81b8c62de94c19
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=teenage+mutant+ninja+turtles+out+of+the+shadows+watch+online+free PDF link annotation
    • http://mrtowing.ca/Lawyers/userfiles/file/suviw.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/guradok.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-4/20210904024311292119.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///bebegirumiparabufuzixus.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/51209367856.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210903190306768947bdo2i.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labobi.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/50406585213.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/fa94cf9facd5cc99ef0655767661d12e/zufilab.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/9151381576.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/jirizegafet.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210906001907.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/uo4401qjpjfj2ltjl19l5fmo07/sutoviforinufezijigafi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613048d628621---27933097272.pdfPDF link annotation
    • https://zd-zeta.com/uploads/files/202109052159124130.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/53779339124.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/fidurut.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/13581772983.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/11924849858.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/bfb0ulh3d2rnsfdm06mm4bs5lj/jinogodetolodotilurulumek.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/57306911534.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/feret.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/xilitorizonirufulagimapiw.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210909_85939D8FFFDA6397.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/20536191439.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_off0000bb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35D 16232 bytes
SHA-256: 9f2b838ae065587f9d4cc6dfad30e4fe2ad3e1f2b970635d4f851265660d201a
font_02_sfnt_off0000fcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD1 11200 bytes
SHA-256: 1abbe4c767931625c1b14da0905fc97a2d72474181d0e76655795276405d0658

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