Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08f15a4453ba10d…

MALICIOUS

PDF

82.0 KB Created: 2021-07-03 19:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 11683944547aeae09fc7c73e8be87437 SHA-1: 44ec8fd8d989d2a3172bbc7752591b8a7eda73b8 SHA-256: d08f15a4453ba10db6b59dfeff441d58433eee131dfdfc7f09717f63fc33f652
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload directories, suggesting it's part of a phishing or malware distribution campaign. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating a pattern of using disposable or compromised hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a613596995f---68034023193.pdf In PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/wumixuvofoxamakotav.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/86616440943.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3ae089b55af24a990d8e70a1c2fd7df5/61120031933.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/pudajir.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f28db7d2be---toselaron.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210607080918_60k4uf.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/cbe8857264ba62a5c63575ef04e5a9ed/88321359423.pdfIn PDF document text
    • http://debden.org/userfiles/file/nubujup.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608668b7f2a14---povif.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/kulupawababu.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/muletamut.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8bcaa5acb---pusulosidufusoleranapodul.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e9aa8d9a---3006010078.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc3c915154---1053481751.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/d5b15b3af74c5f8921f265499aa5e318/fuxosesijonuwesopit.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/pirav.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/fikekinibabotuk.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7528c88d42---widaxuxomazazeteroxiwe.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/xowozuniremiw.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a103eda2b8d---1842550387.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/16195039990.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160741b935f406---7523962330.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/57cc63cbba17ce29e12214f69cf108ce/88156298891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+sum+of+probabilities+of+a+discrete+random+variable+isPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 11152 bytes
SHA-256: 0dadd794d63f39429e81f84a2690172f0bebdbe5e6d213cd3bcbc6de7e03554d
font_02_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 16688 bytes
SHA-256: dffbf90bd27a00954a8fca25007472594009d242b1a3d066da63f55a6d1e4636
font_03_sfnt_off00012253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 16148 bytes
SHA-256: 4edeb39c6ddc59caaddee1766e6511b0b166c06bf4e7810e2f55693b3fe7b7f9

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