Malicious PDF — malware analysis report

Static analysis result for SHA-256 03738beb12ee07e9…

MALICIOUS

PDF

77.8 KB Created: 2021-09-16 04:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f615c84daa59a975d908509c5bacc6a2 SHA-1: 5503c2144a6ad2c4113d7c2c979132b824b1bc5a SHA-256: 03738beb12ee07e98ac9d6955f93a8d047ea0a1cd11acc2774c7defbc8aba253
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://coretry.ru/uplcv?utm_term=pride+and+prejudice+bangla+summary PDF link annotation
    • http://newgrids.com/userfiles/file/26311231717.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210913161705.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1c6212c74---wumejubuvisazusifonara.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/1503904606.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/vivifobagafewekuvatigiba.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/19486027288.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/192a16ff947aa827ddb6922ee23f243c/girosuvilizuza.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/kawaguzes.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/pariro.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/79951854222.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/zosixemovikonosonuwu.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/xifoxa.pdfIn PDF document text
    • http://special-pharma.com/upload/files/vagirojemubofokekilele.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ba745774d98fd9e1676ffcee54830972/roxufufepilul.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/45244572454.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/fenogabefukotibeg.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/86533499520.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/54992419983.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/lizujap.pdfIn PDF document text
    • http://okun.su/upload/file/fedezexigilipanileja.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/76540001917.pdfIn PDF document text
    • http://friulanapanini.com/images/file/paxumazav.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/36233814996.pdfIn PDF document text
    • https://baglab.pl/galeria/file/lipabidamewi.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/kajokabezi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000de50.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDE50 16668 bytes
SHA-256: 6d08800b0736f2391037722e4c6772258e41b8ca8d20cac51f83e6a764eb07f7
font_00_sfnt_off0000b295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB295 17184 bytes
SHA-256: c4845bf7ecc99c84a2d2add79dee5e5ee5b9fd0a0199926ed4cc7e71c70a28f1
font_02_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 11124 bytes
SHA-256: 271d0a5712369cd3aa5222f1415087394ccd7f69f16e46b166461344ea3541bc
font_03_sfnt_off00010f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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