Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2edf588d5906e3…

MALICIOUS

PDF

75.2 KB Created: 2021-09-24 21:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5830b1c2a6ce1e0e862bc20ca16e14c2 SHA-1: 895e226e8306d251b8263515017421c21051d7fd SHA-256: ba2edf588d5906e3b416678738685c97e8941cc10397c279f03f557057985082
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 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://panificioilcavaliere.it/userfiles/files/dikegilawaka.pdf In PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/kifulovekoduzizakidaras.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/50948577851.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/92200606013.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/zasejodimejakujosiwo.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/faloniwetesa.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/kixereworu.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/xudodef.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/91865280210.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/35b645486ac2b68baa80c252c8583060/furozewanepup.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/lavonaponumowetobow.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/85708702456.pdfIn PDF document text
    • http://123dvere.sk/files/file/kogaropope.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330c4973188---54457340667.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/gatorogakevekobevetexa.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/26972947141.pdfIn PDF document text
    • http://okun.su/upload/file/pusijirugufulaw.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/49479314827.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/livejalomid.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/0lqn8s1jvp4ibfbquarp6o7u83/wefavavavisikifofe.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/vabudekekibutafupud.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/depakara.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6133216c4f266.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/37735212930.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/1348008395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=muscle+organization+diagramPDF 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_off0000bf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 18076 bytes
SHA-256: 81a26b4ddda3a5bff55ab06ea4c34c0cf0dc29b888b21bed13fc8d5d7c22d7c4
font_02_sfnt_off000105e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 10868 bytes
SHA-256: 57949528743d23d27c3b339f4cbf8d33667abf714f06db7670e9a6d66c95e029