Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de1b40ba82f907f…

MALICIOUS

PDF

83.4 KB Created: 2021-08-20 12:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5b826c7ff2b56eb4281ff55e87d48c7 SHA-1: 3d9e68a0ce2e934220f59dc62c1d3c0f9bcfad12 SHA-256: 2de1b40ba82f907f740b70010bcc793faceebbc4ff72ff3bca440aba31e84e31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://cructi.ru/uplcv?utm_term=download+spark+ar+studio+for+windows+7+32+bit PDF link annotation
    • http://tokstar.com/_UploadFile/Images/file/44010587951.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/54994554155.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/bamub.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72187070772.pdfIn PDF document text
    • http://infunplastic.com/d/files/zifodufasepixevatupo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee440391193---2791647279.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ca2c5ef60---25747408132.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/migowibapetosigifaz.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/dazedavajelubutadex.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc86bb5d3c---nubigavapuguvis.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/65114381997.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/1415076195.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/945c9708132fc260690e38b3f13cd607/24698846894.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///7751869541.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/dhap1ho7f1f1qcjrhlg35oemuv/gisomixekezaza.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/xoniwuvotuvadomeviv.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607822d74ee18---vanovuwu.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/c438815c244c80e4027f000e6e89db59/47884377790.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5bdb3171c---wazitunaga.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb309a04159---tixexegi.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/wafubejokofeme.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/tisuponejunogologi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098507ceca6d---jewemobezemomezukag.pdfIn PDF document text
    • http://polkovnik.su/upload/file/sozusezelexonogavugo.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/36707844015.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_off0000e034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 17116 bytes
SHA-256: 06c1f1d83494b459bb316fe49990a7d33db7a087f0d53b2a9f6eb3c3d5760d6e
font_02_sfnt_off00012496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12496 11120 bytes
SHA-256: b8cc939100609c15cb049c31768afa93c6d935f68e279a89f7d22868604cac4c