Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b38e6e2fc1d18fa…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 22:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3e383394d0fa581660bd9e8251f95df9 SHA-1: ac65b59a9b03bb3da9331859b389563d2fa83d83 SHA-256: 1b38e6e2fc1d18fa7197abf7e41e9ce4672261e40f87c22772cfa7d2d5cbac69
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. It contains numerous URLs pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608065b7e7dc5---dubagorowapafawinokavav.pdf In PDF document text
    • https://dineflon.com//files/55567262537.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/majuzolox.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090117fc7903---74473320439.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/453e9db204ed1c400fb0a7fb6953278e/nujadonagivenejo.pdfIn PDF document text
    • http://candientushinko.com/images/file/kevajid.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/13357317175.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/hp8nioncrdlv68cvjehl6svdn0/32919369110.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160aaab37f3274---tulanojes.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/sutevokiduwifabafa.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/32555357589.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706e118bef1---76602214114.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/mopugunilesenakepubisinu.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/dabujatokobez.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/278edca6de035ecce2c039ee2e552a18/77207203991.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/rilizexuxiledu.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/20496624107.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/38899855127.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/rekawagiwuxejinufesobub.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/85686733077.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ql115e07lm7nhebq0qfhai34h2/lonoxezexukurofi.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/gorur.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/vejusewasig.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/muxudivegot.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/65760496689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+third+harry+potter+moviePDF 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_off0000d6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 17424 bytes
SHA-256: 4447920222b7309ac8d5419c32d99c7a9c62dc66e3c12cc6f9fb8a1cc89e3be9
font_02_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 10480 bytes
SHA-256: bc7ba9bd86f1b3165a24e78800dfe0172704c8a9456f20778e6e9fd595aadd2b