Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd86cc90ca9e6a8…

MALICIOUS

PDF

94.2 KB Created: 2021-09-17 15:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9578729b0973054b886b1ac7ccbc51bd SHA-1: 19980babc69b9e54cbb2447fea02fda298e551cd SHA-256: fcd86cc90ca9e6a8eabc31ef1d31044faaedeafc43f3a2c9728fb274b70d4631
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of 'utm_term' parameters in some URLs suggests an attempt at tracking or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://pistant.ru/uplcv?utm_term=ranking+najlepszych+gier+na+androida PDF link annotation
    • https://weyergans-hcc.lv/userfiles/file/vuwunijutujevomap.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/ralobogogiwu.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/65757890728.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/gikobopi.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144682ec45dd---256221.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/gemagosusese.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/komizakelutasusefap.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/98397894779.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0f14c4ae7---xigudufedoz.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/nipejafab.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/julifozof.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/83319629484.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/48425045671.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/ralaxuwatitifi.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091606013490.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/vazekiwinokipid.pdfIn PDF document text
    • https://777mto.com/contents/files/65073095033.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/358c2ad74c75d49cd53f93b85950ca60/xasijezixinugubizemefi.pdfIn PDF document text
    • http://trieuduong.com/images/Download/zevuxawozagimudokir.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/95539748926.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161420d64761c9---nasenabomafezatejipom.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/tivasonegonawafojozafa.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/miwureforibozit.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109040021579322.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_off00010ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 17908 bytes
SHA-256: 840860be3f64a4bb82130fc68acb61fd6d3db5f861cd7964ee8271109ed5c5c6
font_01_sfnt_off000137d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE8 11136 bytes
SHA-256: 9f7682821f9d566f28d28b84c380072417c904f6ee155bdcf70b420f19f17543