Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb9b49a0bb99b53…

MALICIOUS

PDF

70.1 KB Created: 2021-09-06 14:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f2eec8e88710a241c5841bd2c91147ab SHA-1: 75b19a1a73924e682f9a4cb0958fdcc38caa44d5 SHA-256: 4bb9b49a0bb99b53a388b177858854922e4d48efd73a53e948a69d4620dcd0d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/c8g7ms21ddr6irbpeoi9augme3/zajenotufixaroraviwi.pdf In PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/duvidasukewurifedot.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/gevemurexek.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba808c9d6c7---66513249025.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/61406978686.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/45987809224.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/bomobitaj.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16076e09d541c2---81725334430.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078a8cde9a9b---31993938724.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/4be64d347dbd952639129534459963d5/65320636345.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/4068826099.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/91298675810.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/93431337391.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/u8m9iieb6remkk330ae4h1qpn2/70528315082.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/78140660233.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/12244235525.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/xulopelawifegugitasaba.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/0ggmkpv2ah2afvrmndhvck1mft/wisofixawepekigulusuxined.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/gigiluzuzop.pdfIn PDF document text
    • https://gilbertems.com/videos/file/sitavisitonifolap.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7572ce0c---bixukilebunobif.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/10626429067.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7bc34b8ab---pevobezaxex.pdfIn PDF document text
    • http://xycrusher.com/d/files/2852955708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ohaus+spx6201+user+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_off0000b5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BB 14412 bytes
SHA-256: b7cbe1577299430d68d15b83c4fd146af2fc1ca0976e7a634428ff406f53bea7
font_01_sfnt_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 10896 bytes
SHA-256: fe0e0c4ce1635cb63db5cbde0c5c866769a34e118d087b5741bc969c73fc861f
font_02_sfnt_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1