Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf38fe3f3e4bf9f3…

MALICIOUS

PDF

73.1 KB Created: 2021-09-05 00:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e8b2ccb4ba062c5c054a757ad0398bc SHA-1: 68baa0ced51c1d39ac134168cf52d67c360238bf SHA-256: cf38fe3f3e4bf9f3f36b40665ea8a73f96123853494154dd17eb1c2c4cf31012
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links are designed to redirect users to malicious content, aligning with the characteristics of a phishing attack or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://daoltrading.com/userData/board/file/musojaw.pdf In PDF document text
    • http://haiqi-machine.com/d/files/42285871372.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/43862542843.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/38742015116.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/zevum.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/b90acee374e6a95a4dd1ea1065f8f06a/66013256532.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/a14452c3d4d0fd50fe06daf290ec0d97/jinezenamuxodekane.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/21698631293.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/30888943951.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/tebemexufosa.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/k0kpnomb4katac18d78ccat2af/94939234741.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c8d52f7f4---36694250946.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/fa95daljklogjkq8vdchpu1242/65149151802.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/6765017209.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/serajesofazejufobaver.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ece22cfa56403dc9cd55ea9d70f8f20d/84857447738.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118ae9d2dff5---27954693791.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/dijopotozoxenevibijevo.pdfIn PDF document text
    • http://jainfarms.com/uploads/62763242560.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611efe7c24a39---wamilod.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ddde2104947---14948952101.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eddf2913e5---52103697042.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/84407572825.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/73769878102.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/10299796600.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/fb3e1f7f816a8cd33bcb0fc0ab686458/23473812578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cavitation+of+hydraulic+machinery+pdfPDF 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_off0000bd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD526 11028 bytes
SHA-256: 8c4645f3de80673215e0fe0188287ea690d2cd56a50beff418d21745aa99145b
font_02_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 15560 bytes
SHA-256: 95a374fb15d7ab3707a231b3a3baae30201cf5babc48ef193ca2ebf8d3a7b47a

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