Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc52e37542e82be…

MALICIOUS

PDF

76.3 KB Created: 2021-09-29 09:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8a1bd6bcb8910a46bcaf7bf28f82f499 SHA-1: c606ab009eb043439737d685af12c9d0ff43da3e SHA-256: bfc52e37542e82be0dcb68823595505c8d4fbec605e38e203cbfde58c3838af0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are identified as disposable or potentially compromised. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the structure and link distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://needletherapy.eu/upload/file/pagutazawesawilekux.pdf In PDF document text
    • https://nutricount.cz/UserFiles/File/gilibinikur.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/i50cqd56dv89gq401u2ivqq2t0/2645392138.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/26066658169.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kaxotumamuwitikipovexifa.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/pimixewoga.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-23/20210923194347679353.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410facca4db---dimemowo.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gizuwikojirukol.pdfIn PDF document text
    • https://media-get.com/userfiles/files/xeradotijuziton.pdfIn PDF document text
    • https://fong-cai.com/upload/files/zisuvekigovimevu.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/mitimitilesuguf.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c32b675096---69902226605.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/vegunipitutapox.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/c0c7da726d0ea01f0cfb54fe9e7237b9/xemun.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/23492146741.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/28294452060.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/dezipodajerozezemu.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/20092090306.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/80468329954.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/15802025723.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361f9634de9---26678688945.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/bokem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=don+bradman+cricket+19+download+for+android+ppssppPDF 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_off0000bc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD425 11320 bytes
SHA-256: bc3c582d8b470e71e216ddf18456283eb7b9e5368bec1ecfd16ce2635e607530
font_02_sfnt_off0000eea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 19612 bytes
SHA-256: 7ca9988ee257199ccf5c449e4f9f5a6eb4b8011200cd112bf0a08411fe152f47