Malicious PDF — malware analysis report

Static analysis result for SHA-256 6718edceae67f8de…

MALICIOUS

PDF

91.8 KB Created: 2021-07-07 19:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0fa24a96ed99cd07e768c1ad4ffd8cb SHA-1: 6a9629d8b5ad99ed103eeb288ebd0abe07196276 SHA-256: 6718edceae67f8deb5c98a09d6f5c44a252ccf3cdfb2eb04af96769753bbc483
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ji2ma7juckcpgof7e67t85g0lq/26578149145.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c111287beba---dabefifefesozibesijap.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/fab0ef5cfb55dca169669bb5e8def39a/51512559586.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/wosetaxelimobetobag.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/zulironuperelotuzakaveti.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/rmkhqis7ust5t1iv3ka2j9bl07/buvojed.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9ffce0a4b---2591330277.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16224725004745.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/41434634731.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886d08cba93---52973077249.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/juberidebefadimidagusu.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/40331763874.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/85822660532.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61548985128.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/82642061869.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/27301053215.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/worosazujelufokaketesiw.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/241837333690.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/vegijowebarugununaxuzaj.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/eaa0220d8ed837076fb28df400225214/tululebaroduvuxokirifet.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/dujatewowejabotu.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47ae8525a---88301672637.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096b90cd2370---naropuvesogamadamigazilag.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/55505685425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=word+of+mouth+consumer+behaviorPDF 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_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 10992 bytes
SHA-256: c82e5fd535ac1e82fb70bf5c69cc06fa2754f20009ed3f3a4c714397fa3f8300
font_01_sfnt_off00011c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AF 17368 bytes
SHA-256: 619448df90e758e1ae327c89744cdc60174e5b60c88af75c9cb6f1f925b4eb65

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