Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be4d491ec13d37c…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 02:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38d016cd0afd03361bd1b30903af3fc8 SHA-1: 72a068298187e5d002b2823f7694073f856fe1f4 SHA-256: 0be4d491ec13d37c2b520dd493b700e141a78d5f7c14ea76e11c67fca2c8442b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crysiq.ru/uplcv?utm_term=there%27s+a+season+for+everything+verse PDF link annotation
    • https://fceresources.com/ckfinder/userfiles/files/polalinilulame.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/92935871498.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832fd76086f---lafabewejinede.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/kibopomizivufotekofiwo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbe98d9ddd---26053369547.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nilerirodararefadesazaveb.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2ab6cbe746426c099aeaea2928e3311c/tizelobitopowazuxamerisi.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1074425520609eef5ee7f0e.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609412cfa42cb---87182446766.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/13565794008.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/xebavuzilifeba.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb83ebfa7c---tixuvibeto.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vgf9j4gdhmt7c0b04eqf5jkmh5/79650380288.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/xumifo.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/4565463982.pdfIn PDF document text
    • https://nic-n-nate.com/files/files/kukalimemurenogu.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/98539537821.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/bilukozilamasunufi.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb54ae6736---wugonamewuzusamela.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/84004038694.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/203610476f01036bc747177e227924e4/21715468250.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dc4362c0d---kebufepexed.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/8v4pfjlomchn85f4ef17enb18i/67409891239.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ff615b78---49407908064.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_off0000cd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 10624 bytes
SHA-256: 3e8838fda15b99510dcaf0103b5dd4b33748e80f26461c096c6a5f408cb93f09
font_02_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 19172 bytes
SHA-256: 251095cd3c867e391cd07d7a4dae289e5c1007e0ddc58756918a65ebd74df42c

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