Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46fa7d02e27a0a3…

MALICIOUS

PDF

88.7 KB Created: 2021-08-18 06:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb2597597ff6afa6a42203017c65f2af SHA-1: 7310347d77c57bf642466c87638cc25d528b4742 SHA-256: c46fa7d02e27a0a3fceaf0af078093766b4ebb775f5d7222aa77e5ab63f621b0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs and link farm structure are designed to lure users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=how+to+win+the+tower+of+fortune+in+angry+birds+2 PDF link annotation
    • http://businessvaluationapp.com//fck_files/file/88622787863.pdfIn PDF document text
    • http://houselandia.ru/files/37177255277.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/13296220433.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/jupekuwumajipefepazedira.pdfIn PDF document text
    • http://vodnik48.ru/content/file/19907829322.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/milavafub.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5555dfaa8---28860258379.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/603lds9q6rgefdqremmlhjajp5/88475785364.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/06588f1505e158f7045178fe670bf380/53940408927.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/famukixiwogi.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089f3d25a737---58947074585.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/lomemut.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/22379812811.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074755dad5e6---papavorewi.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/funagomobelulemuzibevega.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcab9415e3---86596908034.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/musakidimodavisemexig.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160984b5048b5b---43547248571.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/aa944d2b39b6f8044158c5fb1b04b49d/gokeziv.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/rejilito.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609524e7bfb50---89220141838.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/65450089015.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/14463323743.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b65406779c---ninewikapukubunedodesawof.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bopofo.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/nexiganeraj.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/70de94633500e657c9acdc0ead5917c0/vupijivojulijiwekofonovi.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_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 11140 bytes
SHA-256: eae32502e13d96b264007d9c4d855b46e0bccf02fe3c2ddf186cec14374c5dec
font_02_sfnt_off000126d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D6 17132 bytes
SHA-256: dd024a6da34a2740be8d866b82a578e79bdc2c5f2ed9435209914aa45b842f57