Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bccf453124346fd…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 22:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c93a528268a6e447f8e541d258b72ec7 SHA-1: fe173070296855232824ed41cb959adaf339f871 SHA-256: 3bccf453124346fd0e840fb2a013976ca1aa80e7881d545e024762ebf5f19862
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites and disposable hosting. The heuristic firings indicate a link farm designed to redirect users to potentially malicious content, with ClamAV detecting it as Pdf.Phishing.Trojan. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 8

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf13cb15888---17959095419.pdf In PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/575b045775651cadd7f22fc7d0579eab/bepunajagutemabuxetow.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c505ae22b9b---35410396329.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/c55a2611917933766671966b5c0e4786/64624638032.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/5c16f3cf807a5605039e240bfc0e9dfc/venabanexuk.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210815_8010AC261509970B.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/goxilawefusat.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/6d8b4da9a4371331c03a429f935dd077/92552078144.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/u16pqt09pbg6b3aahbhgmj0c33/28454644711.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/romidogekezifobavaxa.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/juduzijiwel.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jd5i48ibnu3d3p9d5uodcmn3nc/dorub.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/24825059865.pdfIn PDF document text
    • https://campermagazine.tv/public/file/zawekezaxipa.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/65d5cd241bbc806406bff879f0e22f10/28716049165.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/nepetarerutodixikaxoxidar.pdfIn PDF document text
    • https://clinicscrm.com/img/files/84216945697.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/tudesimixobilupakimiwop.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/gadudiwar.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/xipufisiranibe.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad01ea17c3---julutubemujedawupesimaxe.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/63489809355.pdfIn PDF document text
    • https://aksusu.com/upload/files/87208200335.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/zifobupemopejimokiwoxo.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/nowiv.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/vajibagiguku.pdfIn PDF document text
    • http://krupongs.com//images/file/23178044816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=photosynthesis+and+cellular+respiration+work+togetherPDF 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_off0000cb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 16140 bytes
SHA-256: be43199363a1514659e63dea76b58001baaa01269db2d34dafd55b4a2fed0b8b
font_02_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 11184 bytes
SHA-256: e255a9c71741d28ad6977516282c5c4e8903f394f454723ff78c68d02c877a69

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