Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f4d946dc5cb756…

MALICIOUS

PDF

74.3 KB Created: 2021-09-13 19:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7404245d6357dc09a147d8b9f10e0022 SHA-1: 8430ba9b554006fb888b8d2471c30d5e1e537e75 SHA-256: 23f4d946dc5cb756c919ebc06ed4f7988730e8d989b2fc787b8801e2d713d107
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and presents a link farm pointing to various PDF files hosted on compromised or disposable domains. The primary URL suggests a lure related to game downloads, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=assassin%27s+creed+bloodlines+android+download PDF link annotation
    • http://mundori.com/js/ckfinder/userfiles/files/51917353081.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42d818d53---44726429122.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/pibepanumulumotewedafuxa.pdfIn PDF document text
    • http://e-menu.hu/editor_up/piwuxojusolitanir.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d43bc2c6---sejavudunonisifi.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/95331510518.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/sejebopidizinedula.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/woxarimutepiwovu.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/24848202972.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210903_8562D254043BBADF.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/wupexekabekejomujaje.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/baritotal.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/gobunirifaf.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137976012b73---52944473120.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/zubawewakufad.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/40334323061.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/sesefetesu.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/zukejifovakilidu.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/64124259675.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161370f3562a1e---talawaguvavizataw.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/58393292532.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/37965434209.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/buziweduzenop.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_off0000becd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 10508 bytes
SHA-256: fa500a35ba27da0b060ffe0e916b2dde94054cf143e3b22b3062e7b710be4699
font_02_sfnt_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 17368 bytes
SHA-256: 5b073af94e02e96e7a234f5235e525d161f6c759165e39e903bee25d70d3d368

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