Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9503305200bf80…

MALICIOUS

PDF

91.6 KB Created: 2021-09-17 19:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 146050b85cc6637ba2d859314b577b53 SHA-1: a785a2e9a0ab001cec5c24f78432653379d33eda SHA-256: 9e9503305200bf80fdda05b182293f64006152cfda5beb65b3a4d9c643b54583
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious sites, likely for phishing or malware distribution, consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=woman+holding+a+balance+painting PDF link annotation
    • http://assessmentinsight.com/ckfinder/userfiles/files/ruvigam.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/28419353629.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/fomajitadurapogaxowavem.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/xarukumovas.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/67be2d4503dcf5ee7fb38f75c6f48319/xorabaneditewar.pdfIn PDF document text
    • https://yasacompany.com/upload/files/68810035625.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/77137040209.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/48332762278.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/2743940021.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/wubovajagidudevora.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/fowixulopulidivavakekas.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/24774964702.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0e432840---62000995096.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/29074195819.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/wijororuvosetokopamox.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/91273631443.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613993e99a5d5---gomufemuwifusinedefolu.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/3228574846.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/vanidozoxifamuwaratitaja.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/66988181417.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/24407251944.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/52780736870.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/jifamiwikifefiwililazora.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_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 19196 bytes
SHA-256: 9b59b2e71ef187fe0958d8ff674b060d3a192ef71b97300f8390f529a2e2366a
font_01_sfnt_off000130a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BA 10824 bytes
SHA-256: 9fd5cff416ce43f80c9bed72312adce47a552af315e89e93778d93d9f226d922