Malicious PDF — malware analysis report

Static analysis result for SHA-256 049c5e8891f73e53…

MALICIOUS

PDF

88.4 KB Created: 2021-07-26 01:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ce6c694d4727e7777cfe200d04ab2b1 SHA-1: 53de147b8079e333695656a21984574face4999c SHA-256: 049c5e8891f73e5305b0ab721a6e2ddc1ace21ddf225b9974b841e861fb56172
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the document functions as a link farm, pointing to compromised CMS uploads and disposable hosting. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://dchs1961.com/clients/871949/File/4872510497.pdf In PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8b67a4e65ec153e27b41a024701c87bc/regovagutokatu.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/3nr12vn4ui047fja8vuf69of2l/zawesasanirujenojaxaj.pdfIn PDF document text
    • https://daismene.it/file/kuredibofawuzuneseg.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/81019761081.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c999a0ab3b---votatonis.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/71310149284.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/kobuxode.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/tusekimuwisi.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/96957621567.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/93fc03ab78a68be5c86019dfa3d00918/87396609784.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/62097160675.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4baf6e6af4---76603696028.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c1c7ba390cf5ff55613857ad51e19a1d/solejulupetexed.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/79469669078.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160986f335b284---rikolemuvuxewup.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a8d8853b7f2fdb13b78ce198361ddd38/jixutodezovadepetorug.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/pozuzatelexopulo.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/ravasimemugewibov.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/ad548934f6bcc3284c00a32b5f8fe08f/kidugumowizijejowob.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/311aaee9c53f70d80609dd813c3f6bf0/gimopenewopep.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffddad752e---guresibalamumoz.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/fevabivufo.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/41768681771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+does+the+quote+actions+speak+louder+than+words+meanPDF 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_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 16768 bytes
SHA-256: 34bbe3d7a31ec33184d7e51683de150f256105268c57377dfe6c4e8b02fbc162
font_02_sfnt_off0001387e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387E 11196 bytes
SHA-256: ead543995819ed4fca08e42c5dfb115278c5c0554fd70bb8d93c7168d6ba5725

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