Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdab5f77e92c1ae…

MALICIOUS

PDF

75.0 KB Created: 2021-09-03 02:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51dcaa9121b8f18e4b2707e51f8876c3 SHA-1: f5ca57546a56db81a0900a65aceebb23d8691de3 SHA-256: 4fdab5f77e92c1ae81b4ba7ce50a00fa5e143dac240955c9e43e0fbb180f2ee7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=atomic+mass+of+first+30+elements+pdf PDF link annotation
    • http://nwatchonline.net/userfiles/file/xiwovubowatakomidamap.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/sojebuzezexesagamudi.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d2b37d132e---natewulapevenifu.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/fixubutuf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c4f714b6d---1746651489.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f03bf35419---58145278523.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/3489258634.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5c959ca89099f40c9f1f79f811414466/61258542746.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a81396760b4---zokolumelig.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f7eed6693e5be91578c124dd57d069fd/sutovigukujibeje.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/14066323429.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/32876395851.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847bfec181b---dofamokoxewimigis.pdfIn PDF document text
    • http://retailcop.ca/files/vopurezakijexoxefanivanof.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755d20ee6a5---57568331321.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087327f9c222---3871151638.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092cbad16c5c---81074144870.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/76916776481.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec12b17293---xomowubidofiw.pdfIn PDF document text
    • https://bloc-immo.com/images/39392861369.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/93869951387.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/vuguturutinumulu.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/57751620371.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_off0000bd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD595 11056 bytes
SHA-256: 32fa413cd1d294c03f8c6c4839d0995dcbfbc6fea54a805c231a394aae2522ea
font_02_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 17992 bytes
SHA-256: 650e55149a70be59947f520726a865e27bd8331b452a5280f85d072f468079a6

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