Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9bf4a5350bfa48…

MALICIOUS

PDF

94.9 KB Created: 2021-09-01 23:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10d9f35530d35c9df147303aaef8540a SHA-1: 5534cfb8ffa62f5c10e84c93be4e2391f92456ff SHA-256: 2f9bf4a5350bfa485e463287ad932c6275c2fda1e3e88ac4e44b55a6b3987d97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised CMS upload directories or disposable hosting, forming a link farm. These links likely serve as redirects to phishing sites or malware downloaders, aligning with the T1566.001 (Spearphishing Attachment) technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://positiveforce.in/uploads/files/68515863817.pdf In PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099d912d95b0---jarukibujawubexo.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/1962975449.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/87432304293.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609503d86d65e---zimuzabekafuba.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27816225906.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/tejimedajum.pdfIn PDF document text
    • http://fitviewer.de/files/file/34588872849.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a315b0504e3---jubavavuvejamod.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607873374d092---limalarerezumepirabasu.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/dnko7d4pih3sl6af5jkn2gne85/vewado.pdfIn PDF document text
    • http://go-forum.cn/upload/files/62903248661.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/puvukuza.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/mtkuf9ccm030o7b4i0373pd5uq/tuxasabe.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/16916222453.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/lowujale.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/mepetitinimabulegilevut.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161290cdcf1561---46929378383.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/wonaxigitawuv.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210708064410.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/wowumipigukafixitur.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/vutetumagojafezigatuli.pdfIn PDF document text
    • https://parc-hotel.info/file/17848378818.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d3adf2bf6---51799352281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bid+rent+theory+explainedPDF 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_off00010e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 10592 bytes
SHA-256: eaf40546db65f53f803119b692c2e5f7dfc4dd92ddf23eaf2bcb5a7f01480ab6
font_01_sfnt_off00012679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8B 18220 bytes
SHA-256: f4d1eec412f510de620b63a542732c7387ed78addc91ac9226f926e66f9b3222