Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2e61d400c8520e…

MALICIOUS

PDF

98.6 KB Created: 2021-09-06 07:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf8767e48729ec949ff631fa1db4fe4a SHA-1: 476e2aff007c4cbe54f71c077cca737dbcd04c66 SHA-256: 4b2e61d400c8520e31a84d922bc96f2429da484abda2ea2f72329d19cd132afb
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised websites. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://5mal4.de/moneyvidya/web/images/userfiles/file/jepedidi.pdf In PDF document text
    • http://arqing.es/ckfinder/userfiles/files/73578138937.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/pemaxuribitax.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-07-24/images/files/bekufukalomagurugobuzij.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/76649118330.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/favote.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/disuxegafomifitemerukok.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1b0f9fd6fe1082e0eab15ae0bcfa3827/wavimipimeve.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ff45764a---52979024058.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160908dcb4a766---xutukevoregamavewad.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b405abe0---rawukipuduw.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/tixikafumakoz.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/58755338789.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/guxizixetefomomemubafuxin.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/27707498894.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/74572361699.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/b9a3d39acd4955dc7d9ed14f0f263d91/71637947149.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/ridunavunotemelitela.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/52749340485.pdfIn PDF document text
    • https://ckmandarin.com/uploads/46273941626.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/64912457318.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/a0513342c9daee2de681ef02c1733da7/vazivolorilukud.pdfIn PDF document text
    • https://fishboat.hr/files/mibiperetowoxuju.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/26120284111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=lisle+91000+manualPDF 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_off0001121e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A35 10352 bytes
SHA-256: 4353edbd90da8a4429e2a1b3dedd571450865f2e41e9b0b72cec9545ccda3732
font_02_sfnt_off00014193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14193 22156 bytes
SHA-256: 6ec47efb82b3b3145b61d12a3bb15a475de2a86c38e12d5f4baf09b4e4a44349

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