Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bf15dd65362288…

MALICIOUS

PDF

90.3 KB Created: 2021-07-01 12:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8751db23c40030b0a209a9c6810b2b6e SHA-1: 9112f6d18b66ee914914cc371f2ebd96b983b68e SHA-256: d4bf15dd65362288eb1d98bc0ff626f2cb38efe016d3200c10be8c720dcc93d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, likely intended to host further malicious content or redirect users to phishing sites. The presence of these links and the overall structure suggest an attempt to lure users to external resources, aligning with phishing and potentially malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0760039bfcce326057a7277d32173c0f/14637660679.pdf In PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/miladapo.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/3073f8d508c84c17b95047424b0ba7b8/bamojokodoxodeteled.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/08a68c739bbb5e4b2ba4d68354f1021b/sosafa.pdfIn PDF document text
    • https://airbays.com/userfiles/file/90893245351.pdfIn PDF document text
    • https://actorconseil.com/files/file/96787061831.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf2aee0457---gusubapafinunasujewujaxol.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8da88f1ada---buxitepab.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609584af71487---74937888516.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/tupawopuw.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890dba57226---98020387940.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hcph9bb9691128gkusbhq5qe74/8347451244.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/auj86ltb162sj7o3v7h5coomb5/luzadosi.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/22889889050.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/nomom.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/eusc70f1ccc7ivd5kjj67smhr7/94200712842.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/fitusowereg.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce963f6cffa---83565723275.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/besir.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/14525892255.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/1p1134t6egonji2tohjvom588r/41534611670.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210611112729.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af955fb3200---25849480803.pdfIn PDF document text
    • https://luminex.pl/upload/file/11983750389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=boring+and+tediousPDF 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_off0000e463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 10532 bytes
SHA-256: 851813a58d4058980ce3b8f5642ad55a306f65d5f5ab0df40993cef97bea84a0
font_01_sfnt_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001146e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
font_03_sfnt_off0001297d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297D 18424 bytes
SHA-256: 5441e208e6e2dd9a203dab29476bf3ed5480b5336c7ee0e66f0bf954af08be2a

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