Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61097c2ddb8d8ff…

MALICIOUS

PDF

74.1 KB Created: 2021-08-20 23:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1177a0062ec58eb7cfa689861c5a597 SHA-1: 16471ce6ecf800e05dc252034229ad76203de506 SHA-256: b61097c2ddb8d8ff626f4b4b4dca1edd3b8758810634527ce55636f359674e1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=avdhesh+premi+ke+new+song+hd+video PDF link annotation
    • http://pileshoppen.dk/userfiles/file/fupiwori.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ca2919a87---nisidixemodaxabugugufam.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/juzotewofe.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/kajoforokov.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/gakuwakatawaxatowokonavem.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/dozovabinipag.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/xekize.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/ranewodadoxode.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/884bb96c1618b7d9d8650a3d25204040/64663044093.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/zikiruzovoxunikimu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/887e310ae4e50396ea00068a4466342b/61170719538.pdfIn PDF document text
    • http://yilip.net/userData/board/file/xafemikotisuvo.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/8508822105.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd18282ecf1---77531205046.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/juzonaxudibekek.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/fcc032be1bbc236862c9f5f0684a930b/vusulokorirekajawedamax.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b97bbcfb50f8e2a303ae0f83fb8c672b/remumekamuvovugemom.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/18a5debc280c84ecb2a31de1cd79588e/pofupekugatomolumidazudun.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/zudovapi.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/muted.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021072008343073499.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/98461095808.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_off0000bea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA2 16684 bytes
SHA-256: c7a457eb531585e41ea691aa950941d970e1d5a9e67a1763dd9fbae0ae793bac
font_01_sfnt_off0000ea2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 10756 bytes
SHA-256: 5a49b9abc7a6ef15f766e5f9a0ae1e2667168b336fcd621512d0679a4d6632ec