Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf06b44395f1f045…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 11:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 76788574e6dec642caa491885da5f5c3 SHA-1: c981c2f2698d5cf87e014e98f8111464a3513647 SHA-256: bf06b44395f1f0458516e658ead309aa9fee712028c708a4a3eac30dc1a9882b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pizzeria-millemiglia.de/app/webroot/img/editor/file/47992408992.pdf In PDF document text
    • http://autosklo.sk/pictures/file/gopuwumo.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/77945008145.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/jupuzemofivagebebevupuw.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/gozufuxuxoxovabot.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/fufajalokis.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160804a6cd3fda---35473417069.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///xiwamu.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/jtdbjp7q6rhhiv20rumkt2i0kh/figudagak.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/nd6tp2l7ga98ocfe831kk37jjd/68317026978.pdfIn PDF document text
    • http://someteme.com/archivos/_20210715091013.pdfIn PDF document text
    • http://devison-matras.com/upload/file/dapadi.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/95117682316.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/op37g1ei2vj86b0krp1spvo6th/mirovovinavidulutid.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/28241682996.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/vobitaf.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bdea9a6b6---54852508722.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/besifozojotatege.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/64435091509.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/45383560335.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/63104651066.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/lodujadexewedixogegi.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/45465410146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=belfast+confetti+analysis+pdfPDF 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_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 17984 bytes
SHA-256: fa1b1e966070f397804fe643227b9c2cfe40c4fc03556fcf9a1ee08774357a2d
font_02_sfnt_off0001209e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 10680 bytes
SHA-256: 5726933de7a32ab48ea5efe40b397b739cd53503f6097c6a22ab4cc89d876c72