Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c21719141b1949…

MALICIOUS

PDF

79.1 KB Created: 2021-09-13 17:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3de01427e436c8b1a062590c0b544ab SHA-1: 729ca863bf12bb89e0a942f2f9a6a4ba031c21a0 SHA-256: 90c21719141b1949c2a74c26bd6ef7cd356870c9054f0fd348e21a70de23f735
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content, consistent with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=android+speedometer+library PDF link annotation
    • https://forumhrdbekasi.com/webroot/userfiles/files/67625790468.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/6105683973.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb34eb850---77640536462.pdfIn PDF document text
    • http://inistor.com/ufiles/files/67593372013.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/23436571928.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/fopipikopananunekeni.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/gakipukizuwoxazigebawupad.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/powibewetipapodona.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139c2968b724---45212673094.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392867885f0---pavivugofaxuwakiralej.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/63594967131.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/gisaloxiz.pdfIn PDF document text
    • http://linza-market.ru/upload/files/77224646136.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/20532371069.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/tofuje.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/nopopasapobamufas.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/sunivojugolererumexezovix.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/89554469174.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/kobetidajufeloj.pdfIn PDF document text
    • http://donghotam.com/luutru/files/memowos.pdfIn PDF document text
    • https://mihalex.by/files/files/zubedebuseb.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/rutusazaxapewaguj.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd3022d357---5269713176.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/73926732035.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138b1141469d---23174894586.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_off0000cd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5E 18284 bytes
SHA-256: 9f44b24fe5ea1970f9635f602e9591167d12fdd84541fdd920bd488ec8cfb75a
font_01_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 10788 bytes
SHA-256: 3cbadc7c9196849e3ec09bf2ef2ee62e367ddfbe9d53a67c0fe5fa26e7fb544d
font_02_sfnt_off0001166f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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