Malicious PDF — malware analysis report

Static analysis result for SHA-256 c148c309daec2cdc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 23:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3079cad6a8a76513c6282d036847c493 SHA-1: d18b7e2a29b1dfd375f91b921b5461717f6d604f SHA-256: c148c309daec2cdcefce33adee2460f5dae25aab6db8afe2f9f6f950b83da772
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure point towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=windows+7+ultimate+64+bit+download+highly+compressed PDF link annotation
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16142c2276b460---fawisipiwidatejabafuvige.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/13110303762.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/6b13479c6517d89a56607de9b170ed15/52387512990.pdfIn PDF document text
    • http://apart1day.ru/file/tijigebivul.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/72497304269.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-15/20210915225957733664.pdfIn PDF document text
    • https://solturism.ro/images/file/86146183154.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/17424436065.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/wozapizumugetu.pdfIn PDF document text
    • http://kvrhousing.com/uploads/98222137562.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/gawitaduz.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/23698948473.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/lubevurikuviremikip.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/18960838522.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/vitegerarisipad.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/90114287170.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jiduxesarotikek.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c5d469b62---wijofowitudapekixexijo.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/xedowupum.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/35317671950.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/66175260039.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f6f897800---86962730578.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/48069431784.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_off0000d546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD546 18040 bytes
SHA-256: e4e77f4d93788e3322d3e6984e91fa07a3ecc53cf8f4cf5b0b80bda9371fa42f
font_01_sfnt_off000103f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F3 11688 bytes
SHA-256: 1a04ada2ed25d6fb4f2aa77d90ebe55cf81d024e359afacde35c7d38791fb459
font_02_sfnt_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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