Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48dabc6857e1b18…

MALICIOUS

PDF

87.7 KB Created: 2021-09-07 21:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 832263bf431e04799534dc8a92497510 SHA-1: 420f7994264846dd1484d88026f919d1e5384619 SHA-256: b48dabc6857e1b18ace05025691ce9ab111cffe5c561e7dbe7286f1c8373bc49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to various compromised WordPress sites and potentially malicious URLs, such as 'https://irlanc.ru/uplcv?utm_term=air+ticket+format+pdf'. The heuristic 'SE_INVOICE_LURE' suggests a phishing pretext, likely related to fake invoices or payment requests, to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=air+ticket+format+pdf PDF link annotation
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971d7743313---jixiwinolirosesesi.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/pejaluzana.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b86d34115b7---21359519958.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e2a40e8ac---29539648514.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/65617260205.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160883239cffd3---rizapimasuvidivokiz.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/71150336593.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161184ae859bec---99742253473.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/49189343661.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/70376595241.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/porijub.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/tubakukosobo.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09db79ab3b---dikugubojutosuboxarexa.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/97971549281.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62525536740.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/pejus.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/31537022385.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/38dc07bc03e1aa4604a304429f7f3f7e/nabijilemirujasutibasaluw.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/27280153836.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/88460469969.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/24614194366.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_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC6 10536 bytes
SHA-256: 85b806e93e30bef00bab95f870786bc77b1939fffd9dff0e7df2dffac0bfdade
font_02_sfnt_off000122d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D4 17928 bytes
SHA-256: 7205422854e8e058cb4f1c71830472ea937afc4983ab09f0ba4b2fa8b0738090

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