Malicious PDF — malware analysis report

Static analysis result for SHA-256 19740dee7fe50503…

MALICIOUS

PDF

118.7 KB Created: 2021-07-25 10:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6718f26ca337cda21818882e4accf13 SHA-1: a678c5fe91d3610d7ed8c6f5336e341e02a9f301 SHA-256: 19740dee7fe50503499bd4a042d065884e33acd6fd3bb20eb00256a6d3aab656
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or are part of a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/39827268316.pdf In PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42a720a60e---47675024575.pdfIn PDF document text
    • http://dentherapia.hu/files/file/popalutiwi.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/44757131993.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7a7c0a8b7---vevokimekaza.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/58169043940.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/9d99cf928726afea0f458e5d04e86f2f/86595654059.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732bf1375f5---65221498266.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b1abbfb65---63155769797.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e0247bc3bbfd7cedd045f6e8a9313e24/41879835033.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac726701f2---pejoweguvarameralunize.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d900d8873b8---xozomasatosok.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/dufijowurukoxosabatejiwi.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608560406fee2---96066398506.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/damabipobi.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/tivosowiz.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/qhdoc4atfslloobf2d80rt31f2/3941358703.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e18ad2b6ecb323919a84e554a03b9b71/bubamajibabesomakipixasi.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607935f5573b6---87464596322.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a068d7920ae---kejud.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/5002aa847c67ab00e580edacbdc82048/bufadud.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/e0gfk2r0hi1kqjvp97do5l8b88/42842630965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=quimica+la+ciencia+central+12+edicion+pdf+gratis+espanolPDF 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_off0001670a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1670A 11292 bytes
SHA-256: f85ba2760da03cffc7c5aa0415a7350b400d06d49627c7358951fc77f2254d0a
font_01_sfnt_off00018185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18185 19380 bytes
SHA-256: c2b7eebe83db633d3334b66cb6c4b58156c6067256a39d64e0a65d19fcbe1c77
font_02_sfnt_off0001b23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B23A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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