Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f0eefd5911f877…

MALICIOUS

PDF

79.7 KB Created: 2021-09-22 09:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c05d2d1d4419a9bcf1e89f6241c153c SHA-1: e5c5c1c90330c9dfc6ab8e47a6647fe2f47451be SHA-256: 16f0eefd5911f877af6d69a2b3df9215a57a52e5be71e1d42dc015538d3094a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=price+of+mi+note+10+lite+in+bangladesh PDF link annotation
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5d77eb06---27521839197.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137912310b23---rumememixilejupomuterewis.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/47988212419.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/xifoxujomatedubefamabilap.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/4390124588.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202194160396792.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/febivewum.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/91882506636.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16139bbbdce63e---30032264126.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/rujixebimageroloj.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614118af6b3b5---45608178887.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210914092404.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383bf9e0ad2---pojidunuvov.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145d0f3e07b5---57230097643.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/44726714134.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613808b000d73---71420590849.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/85426238564.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161345608e3477---74650207271.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/miluk.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/86536807190.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/5824903430.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/86938237421.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210905210144.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_off0000cf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF55 18204 bytes
SHA-256: 9fcf7129fddc9d6c941d27ed940e622e9138e54087670b88f3cd12c43fd37036
font_01_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 11236 bytes
SHA-256: 9609ed6a841fd6175d6cfa2ff47d2485e48b659d46fb03cbd0730b40e11ea977
font_02_sfnt_off00011901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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