Malicious PDF — malware analysis report

Static analysis result for SHA-256 90291fa67c04cc60…

MALICIOUS

PDF

73.7 KB Created: 2021-09-05 22:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 640357ba1d74a46337794ffff0b28352 SHA-1: a072ea36a6864fa282025dc0f6efa0fc8c45dab4 SHA-256: 90291fa67c04cc60a304739c894eafa80e25c048dd9c20c7156d2c1de2a3bc13
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. This pattern suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.siposferenc.hu/html/54143242171.pdf In PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084814319280---13699750416.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b2d1fb49451453b74984282f8b7ade41/43276587506.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70e32e4b07---93322658374.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/pakigefanoxenasogi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/jugt7emsls64hafi51m8aui4dj/87132162874.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/pefasekigen.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/eb0c2e4258dfc410f1008f6041859ed2/45543901646.pdfIn PDF document text
    • http://unsersohn.com/images/file/panimawaw.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bbabd3b8f---darumupuvox.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/56220858559.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/xuvudulali.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee7b87106---mufisubitikifusimenavale.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/17f4486e9f314c89860debeb62d55b19/77231599304.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/sazip.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/nunekiginekarajanixudix.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/um1gmbmr7ujs3vbbo54vi1fus3/74431804627.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/luxofisuza.pdfIn PDF document text
    • http://teraval.cz/res/file/31684101589.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/30693164251.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/badafu.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/fareb.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210823235938.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/zevaxigip.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210722093115.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bd9f78752---jarifulalaver.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/52b5a6b4c8d739523cff5d3ae71bd379/26096517463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=quenya+grammar+pdfPDF 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_off0000b924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 18328 bytes
SHA-256: f6b52703e51a9ad8d1b07c6b0100fa9d9e2c7dd05e03a06bd5eb197152156944
font_02_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 10592 bytes
SHA-256: abd88c44044f2215e456a8b5e35114357e5e09ed19f257cebb85b1a9d42c9df7

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