Malicious PDF — malware analysis report

Static analysis result for SHA-256 4009875788933234…

MALICIOUS

PDF

72.6 KB Created: 2021-09-06 09:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 51db3c6a86385162810a76a5012ba424 SHA-1: 49aec1e91aae98349653e8a18d9b353e08c10c97 SHA-256: 4009875788933234b351a0791a45669dfca4ba01f8df8dd235730bc728512992
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or lead users to fraudulent sites. No scripts were extracted, but the PDF structure and URL analysis are sufficient to determine its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=chimp+paradox+pdf+free PDF link annotation
    • http://farmaciacogliate.it/userfiles/files/tafizugoxixilasa.pdfIn PDF document text
    • http://aa-nusd.jp/fonirawiwonolixefazaloter.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607387d4e40f9---senadavep.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7383d2b571---32939093891.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161260800a4766---93582270479.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7c05bdb6420e9d023fb9af899dd113a0/14118464965.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/xutororekog.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/42617627639.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/92391459020.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/15994139097.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/79685421934.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/runis.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/0lusf8iv61ei07j8jk90bntisr/40785847764.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d2a02d35556245bcae460d185539e8a2/52781459259.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ff859fddd---gutaxalapefovome.pdfIn PDF document text
    • http://bscartridge.com/pic/samuj.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/rf4iv1qcf9kkqcf9b7oh9un5um/83893036301.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/disolesexixudav.pdfIn PDF document text
    • https://ms02bet.com/contents//files/52233598744.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/23782650843.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0648d7ef11f79e94b6dd68302b725c4d/besowaser.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b726ab2bcfa---rupafanobifok.pdfIn PDF document text
    • https://flyags.com/editorResources/file///fopolesedew.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/c60fb8cfd2be28b31d9b3456cee55c5c/ribop.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_off0000bb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB81 10480 bytes
SHA-256: 10f20e65d71dd047f844df3240454938b26c7b91ccb4f2f3eed23f368c5e1807
font_01_sfnt_off0000d348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD348 16200 bytes
SHA-256: a1b51f792ccefba5ee9970b4b75f3cd6d4c436643cc3f9fbd1f989aa73f1248a
font_02_sfnt_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1