Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a91adf209c08903…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 20:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c7c2373b8acfe647c894eb3a38813d0 SHA-1: e602592758ebd744387f0d0db467f1748c21cfeb SHA-256: 8a91adf209c0890333e2f213769bf6e23536b9479fe3ebac4d604d0172183eef
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the heuristic 'PDF_RANDOM_URL_LINK' point towards an attack pattern focused on redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=a+discovery+of+witches+123 PDF link annotation
    • https://fidelishospice.com/ckfinder/userfiles/files/21720434675.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tinobevedakukili.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614042731baa6---44950586209.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/7533366516.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/44656901006.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/sekununusamuza.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/22424562018.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/31163994548.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327b7a98021---temadijilirolud.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210918092506.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/femutitaxavamawomizuwekaw.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/zirovesoxusut.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/xunuve.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/funabikowikulaweruf.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/pewufaletatajunex.pdfIn PDF document text
    • https://matricula.arendic.cl/files/37592409285.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/safojifaxudevanejirip.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/46583990931.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/17131274233.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/88215440811.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/jj6klkoveg1kjb6h3t7mu84hie/joxusipifepudidifetivi.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/zowizubofof.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/71458092042.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7396c955897c37f26f5fb678aaa0758f/61555914245.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/79567092863.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_off0000b10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10D 15788 bytes
SHA-256: 412663ceda7b12e9317503c98ea849162f618e38354c09b7e2905bf509b2adf7
font_01_sfnt_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 10852 bytes
SHA-256: 8b4894a730712c012613806ef5b7f5ac4c6d650dae7e9348c511d91f362e3c56

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