Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3fc0ad392bfb1f…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 01:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 602c6d756393c4adea61ab67366821d8 SHA-1: f1aab1cbaba197618a2a2b384ab9c2ced13ff54e SHA-256: 0b3fc0ad392bfb1fb61c3ef196aaa2420569e087910d85d009fc359d4a169204
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/zejakipizevezax.pdf In PDF document text
    • http://efuturesthai.com/uploads/files/kijewopepulumi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d398c2ca82---14037977322.pdfIn PDF document text
    • http://ubest.ru/images/file/kutimewazaziwofawajid.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074531544419---15646086443.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf13cd8541---78598142189.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f48585ac23bd59287d6a27f85b2520e1/salelukabud.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161104857d77bb---lalafeleboliw.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/vuranemewimomivekudi.pdfIn PDF document text
    • https://livonija.admark.lv/sites/livonija/uploads/documents/files/pisujoruvafatikewadepuvo.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/gijiradifipapozije.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59ebf50128---voxomu.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/xexirexifepunon.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/72216058322.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/jabebavajan.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/govujakedexozijofeliliti.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/kijasuginovixaxofubonuse.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/81628579944.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/87531207205.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/49f06947a29469d19e76ec21cd393251/woketidajinagezikif.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/pafizebukazududug.pdfIn PDF document text
    • https://koreayokogawa.com/ckfinder/userfiles/files/lanozedivijeludono.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/83906480054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+great+wall+full+movie+englishPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fba62ab702---85852237047.pdfIn PDF document text
    • 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_off0000cf73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF73 10876 bytes
SHA-256: c3034c3874c73227b4403cfca55a39bd88a33ac198190fe0083f5aac91eee455
font_01_sfnt_off0000e87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 18672 bytes
SHA-256: fd237267de24caba2f62431ec7b24da7e291793f0a07a6a17d652942111229dd
font_02_sfnt_off000118d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1