Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b142e4aaa208e83…

MALICIOUS

PDF

97.5 KB Created: 2021-07-27 19:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d399d90076b444856d7b55cfc23e0890 SHA-1: cadb444a567440fbb065d1674daf99aed435268f SHA-256: 3b142e4aaa208e8307852fa61962c2f46feef10e3a3c06b98179ce7b5b421c73
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The embedded URLs and link farm structure strongly suggest this PDF is used to direct users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce55085c26d---bozis.pdf In PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e462a0dea30---39404650311.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/gisebexe.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ad73fee579f---8025735454.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10a9fdb851---tamalameriwosumubasopi.pdfIn PDF document text
    • http://aweibel.com/Photo/file/pevivivufebogijax.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/c6jlkj4i54cj4lndo331t8nsv7/vojabotoburavidadetad.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/3b1e6570605a3e0b2fc0c55453846e8d/juzarosenu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae8f635d1---nonofatok.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/60698049017.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/bipelapapemig.pdfIn PDF document text
    • http://webursitet.org/Files/file/45652762471.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/bulowire.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f0f6333192aa12ad71c0cf926f5faa6f/17106688716.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dcbf50a8014---wasofijaledetaki.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b75477a98b---95783381604.pdfIn PDF document text
    • http://benetalent.com/upload/files/tigazoxubimodo.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106291712384365.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/tilekujapafod.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/osqvpqm64b9p4vl7dn65hd35p2/livoregagaminixoxiku.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/4b6c9f3e5177060be61db6a7b3bc4b20/jojogowuluwe.pdfIn PDF document text
    • https://seikico.net/img-tym/files/kixovam.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/20352355562.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10450542e4---fabisobudujuso.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/132d86a7000a97c737748e950fcc93ba/zoduda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ps3+emulator+mac+downloadPDF 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_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 17028 bytes
SHA-256: 15e6a416d8562a090f1f2d0ba1734bd0aa9505d0e4e349107bbb5403ba58e4f9
font_01_sfnt_off000131d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D6 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_02_sfnt_off00014755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F6C 10796 bytes
SHA-256: 0b5004aaa2275355c8d802c0f1145c2df2cb999ea08fd3f75c8aa46666b69cbe

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