Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f2943511540105…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 00:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 267a27ffa79c934a62825928e568d234 SHA-1: 0a3c945362e108b92091dfb8cfae716268d561dc SHA-256: 86f29435115401058537ce3a2184b0242f39cdabce597b8faf5b44f4db0b3e5e
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser extension or update, a common social engineering tactic. While no scripts were explicitly extracted, the presence of numerous links to potentially compromised CMS upload storage and disposable hosting suggests a phishing or malware distribution infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://solmoda.it/userfiles/files/xometixeguwon.pdf In PDF document text
    • http://cnc-soustruzeni.cz/files/file/60923969710.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072bad1385e5---najebosure.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1611e38fbd78e4---fogujorulepewepadu.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/c10im1pnd8122k9v9j2ibgbpd2/60753121744.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/migus.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a433248d262---85418309254.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/63587552584.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/welilojevux.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f0aaf1b997c375297fa9fa47502bc32e/ziwaguvivawupotojo.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c62e878f7---30849315544.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/22267624316.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/45565346464.pdfIn PDF document text
    • http://quangcaobienbang.vn/upload/fck/file/96547070024.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/12126655750.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/jivasetugikadekoxuma.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-8-16/20210816183525589442.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609492eaa6171---gedepulumifajirib.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/fitakepupuxid.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/38199679680.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f248f5c797f---96659608235.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ffa8ebf89---99981236805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=open+pdf+file+jspPDF 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_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 10168 bytes
SHA-256: 7ff66a9f130389e66dae14f235134fe99f0cd9301f284a4ded199aa3f310dbe6
font_02_sfnt_off00010c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C35 17716 bytes
SHA-256: 8cec18cd381dc4bc35a8e9ddfc84ceeb3269754323613c22eecb0b083cd7a5ef

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