Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f7d34fe691d165…

MALICIOUS

PDF

87.7 KB Created: 2021-08-06 11:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d99799a9adde2aada861d273681938a SHA-1: c74bc0f0f6398ea6b5d22cba1fc8aee7a7d407e6 SHA-256: 54f7d34fe691d16578b4d6bcccf788edb744db67d97e8a00ed7fc641606b2f36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of hosting links on disposable or compromised domains, likely to distribute phishing content or malware. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infrive.ru/uplcv?utm_term=liste+cha%C3%AEne+canalsat+panorama+pdf PDF link annotation
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8fd4a9ace1---61727506554.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/mojimikobom.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/q08uc7e61s2t30cvsu0k7cm76t/78498996963.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/601g7j8k60747ks4bqh8qfot0a/putagik.pdfIn PDF document text
    • https://ksboutlet.com/file/files/28170689153.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/rirobuli.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/vosizijiwitelijadep.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/detifofabuberiw.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/wixozevuvuzob.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/64201208923.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/79943152355.pdfIn PDF document text
    • https://combrooncom.com/contents//files/87997579040.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/r0lhodsojf7fe0bkgmo17op0kq/4572107951.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/61013093803.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/kezomifuko.pdfIn PDF document text
    • https://red-adlay.com/upload/files/28935419073.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/88307545625.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/gidalofipevokodano.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062021181870554.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3dc38d581---vazelanovumojon.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/2900544698.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/45f73246946bc437990efbed6252179a/86997604472.pdfIn PDF document text
    • https://wonkingchina.com/d/files/92498907385.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_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 10912 bytes
SHA-256: cf4322f028d392320b6ca5f4e49b3513f0e00546d8e99f7a1baaacab58c89f41
font_01_sfnt_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 19300 bytes
SHA-256: 533d5e52fd9af31e3639c1b6697682878ecc22d1d20cf1d20ae8eb18b3ee8e81

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