Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf00fffec08991ff…

MALICIOUS

PDF

76.3 KB Created: 2021-09-18 03:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 19c2cca98b5e47a81f93504a2e1daf51 SHA-1: 1c44856717f4735c814a2d88b424d6f6ab41cffc SHA-256: bf00fffec08991ff6c054b69e4cbe3ccee906f6b28e724f643ec84d92d41559a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, pointing towards an attack pattern involving redirecting users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=lego+batman+2+apk PDF link annotation
    • http://fantasymusic.it/userfiles/files/zilekidivoleviwepo.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/69979769396.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/webazinifif.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/55933118131.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/14500164075.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/zuzetukemoravufo.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/wivuwivezokawinunemiko.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8s39nos4u0t3881o3itr2njgkt/41174838901.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/kadatakof.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/24500458061.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/dudovajiwevenuze.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/47483046933.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16133d2fe1032d---84771523963.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/50284619683.pdfIn PDF document text
    • http://topas.lt/userfiles/file/gejemixafeluxo.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614404027650d---49313000237.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/kuvojebuzaxanuxogudilo.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/fudepelubu.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021910_145352_732.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/88414421380.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/dunapogini.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109021404012883.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_off0000c457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC457 18136 bytes
SHA-256: 91eb285d2fa89b5355460329dd0add0ab413c143795fefce12d58c2f7e14d45e
font_01_sfnt_off0000f3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 10500 bytes
SHA-256: 86d8dcb7291807c7b82620c53145960a2a23129a5e29eb2d2e618b1884c7b7d6

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