Malicious PDF — malware analysis report

Static analysis result for SHA-256 3685ca1bca31c551…

MALICIOUS

PDF

86.1 KB Created: 2021-06-26 22:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-10
MD5: 95f25166861402a040e07594b786cc05 SHA-1: e90455e1307ae0da6250234dd5f2a6384a777c2d SHA-256: 3685ca1bca31c551bfb78eafb66194b3ca6cd3174361d675918cbe3aacd2d8c2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://ratsimae.eemedia/contents/file/fafoxifilezofujuduk.pdf In PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/s5n6ep2rc369qe4frnn1usf6o2/zunirilivabipuzuwu.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b1e4921d7---94229150358.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f9097560aacbba3d204068508612f112/11327747992.pdfIn PDF document text
    • https://airshow-bg.com/file/vujufudagekej.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a13863bac---venudogosutiwuzefizi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091303c98b36---pusakapokes.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/82263299103.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0c16895f---weranupavisoruratoxitoz.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ee5d8e2d5---35557247704.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/546c369b41adef04aa0efd2531b081aa/gawanawurelevigafovuk.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/l91hotqtl8n7ujj943drhd0pm4/jugeliwixukivot.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/73664587363.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0739f9fd87b582e0e47f6a4f3683cebc/xenanuxufuviwon.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fec65c6337---negete.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/nukezo.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f7e2ee87a4cc0004cba376032b07c1ab/fodopovurumivu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/1rk9dvta1vfoaanmol5hch0991/60045013546.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/9fe6386e7bdfd9f884db0eba5af072a0/meroletaxara.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/41269677291.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/pejuromolusano.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/m28rrrqose6m2opnnjnd40m5s7/siralawogurarikabi.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/nujoduv.pdfIn PDF document text
    • http://firegallery.ru/img/upload/24323850021.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/310022837.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/cde8d44087626642cc50bdc4a6f17164/50409255521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=adjectives+with+letter+nPDF 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_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 16636 bytes
SHA-256: 2e74c67a4ca9bef085f5d5082dd41d1221698a56f395901ec59e67c4f0073573
font_01_sfnt_off00011b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B71 10448 bytes
SHA-256: 5c79b039efa1d5121cc286f0df2bcabbce4159dfecf4e44c2bf5b823f88075f9
font_02_sfnt_off00013311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1