Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b00a7e05cd596fa…

MALICIOUS

PDF

86.7 KB Created: 2021-09-08 19:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9becf1b15146bc47a4d86daf814ecc64 SHA-1: 3beff4585a327f0141a3199016cf89b6f24f31ce SHA-256: 6b00a7e05cd596fa71a342edabba4fbca909c7a577bfdec25ab0366ff4cdb535
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links pointing to compromised WordPress sites and disposable hosting suggests a link farm designed to redirect users to malicious content. Although no executable scripts were directly extracted, the nature of the links and the ML classifier output strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://textstricker.de/benutzerdateien/1166769370.pdf In PDF document text
    • https://nestsearch.in/admin/uploads/file/58138229729.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/jonobimefeguxud.pdfIn PDF document text
    • http://esejsc.com/upload/files/getikepakolozejofe.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/m7k6p4oh34gqbvviuoctaa7hi0/29414003706.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/87019549470.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/29021756222.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/bipawuvozaludaver.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613546724bd0d---wedumepiwotux.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132fde3b5b95---dakisolubetar.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/wepozutedum.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/7896376865.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/42148671132.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/67088625157.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/vesusepakekapulivu.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/semokamovesu.pdfIn PDF document text
    • https://citronel.com/userfiles/files/11680172892.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/mekikapefekax.pdfIn PDF document text
    • https://maymac.info/userfiles/file/vadovuxukegodume.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/nukolukukolamixemizuz.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/90974794488.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/g0me0uehlch05r3pla2u9jlj7p/88404335195.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/nuvapi.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/76708971786.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/nerunojibupinuritagov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=careers+in+psychology+4th+edition+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_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 18068 bytes
SHA-256: 7a6bfdb7ac46fdc496daf47f4aa00cf334c6aaee38fad397a2b01537bcd0e747
font_01_sfnt_off00011b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13346 11124 bytes
SHA-256: 4dcb546b431f89fe979c8ecae7f864c1e5a231907bbf12363add430eda759e8a