Malicious PDF — malware analysis report

Static analysis result for SHA-256 714acb55863da52e…

MALICIOUS

PDF

97.2 KB Created: 2021-06-28 11:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3c1dc02a0e68b23ae0ec305352ba8c0c SHA-1: 9ea04e126508b4564f3a18a204e6fa16db9037d2 SHA-256: 714acb55863da52e069e63b2e442505a48b4cfc22e9d78e693db33aae07e91e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability for client execution. The file functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage, suggesting an attempt to lure users to malicious content or phishing sites. The presence of multiple compromised domains and disposable hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/785e1926d17e1c2426352832bf24ad2e/7361331442.pdf In PDF document text
    • https://hse.tw/upload/file/sepuzefegufi.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160892d0a71d80---14737727347.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082b80d6eda9---44498524215.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/2ebfc92465d404629b6702da3daea62b/zijupexexojufomiwaleki.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///pisefodijemisuxifojuzuxi.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4a8550389---11867720790.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f284ed4b7b---bagapubiginawebinula.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/zuzewafasefevevovon.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/bdb1956a43e9e75e2829e69a903e1724/1862155077.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/91274052747.pdfIn PDF document text
    • https://soechi.id/userfiles/file/37542439490.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608707942296a---60786418728.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/pavuzolapaferegogagare.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160873aa20cee2---zomavetofek.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/52817743793.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5e6c7dd4---tavukodasituxapag.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608123a7a4d87---zutifinudoxupu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/q0ecffhpdeqjv09ecr3d26720k/viruruvoxobosev.pdfIn PDF document text
    • http://navigator-33.ru/media/file/37147580613.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd06681536f---15071965385.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/47623045424.pdfIn PDF document text
    • http://faradbox.pl/files/file/85130273665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+the+benefit+of+eating+honeyPDF 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_off00011bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 10592 bytes
SHA-256: 19beb60e33a27ccc3445fc50959028a2a4bd16a87caa9cd7db74aca4e3f78081
font_01_sfnt_off0001340a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340A 16740 bytes
SHA-256: 01f8dcded44c878b76b25b9de5d35b6604dbb88acf9a4c05abb87717f27b5a38
font_02_sfnt_off00015f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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