Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35dc2d1132f0a70…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 13:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e8efe9abcb156b43710ba3ca6764334b SHA-1: 69cb9bfade217e234a4859bc59e6132854594270 SHA-256: e35dc2d1132f0a70f9f7a548aaf889d85c79a31e64585623bd3ada9777e8d946
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://stoka-saarlouis.de/userfiles/file/xowarage.pdf In PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/83997095984.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/11637931052.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/vupitedul.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/17167858327.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c43a884e95---84894407618.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/luxetisamekokote.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/rufegivujipokegokoj.pdfIn PDF document text
    • http://linza-market.ru/upload/files/giwefazapi.pdfIn PDF document text
    • http://ativn.com/upload/file/44898265746.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/rupobusan.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/dndl1j62qjb85q8nob0rfr15o4/44008323069.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f3384c0c2c17893440e6980dbafff442/45630003444.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/zakebawam.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/vevapetakoxufe.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/neloj.pdfIn PDF document text
    • http://metall-press.ru/files/51014849575.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1615258b4285aa---xerikosavamumuzuni.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/26/file/72723994880.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/gekarusetogu.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/31213354199.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/50406566528.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/27090140637.pdfIn PDF document text
    • https://cartolmania.it/file/64618068459.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/1582607958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=malayalam+movie+torrent+downloadPDF 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_off0000b229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA40 10500 bytes
SHA-256: 19892c3fe79084fc4e559fbd37bda8c3bb96453e68f05bc9ddc3e9fbe63eae55
font_02_sfnt_off0000e21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 14696 bytes
SHA-256: c2191e0bea9f300ff9b52460c26e12a096ae3c9ec88252b54cb614d2ed370609