Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4f2d421b9e3641…

MALICIOUS

PDF

94.3 KB Created: 2021-07-21 02:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d2db3642731c4abd19fcc9a30ca8557 SHA-1: a47d9192736fe76c50977aaa49bc028f17d340d8 SHA-256: 4b4f2d421b9e3641d3db0515adf590c9c689f130c171fdee3ebd0659d3878d5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e2a06a77dbfd8847a1bc346de6abbdf3/25313183104.pdf In PDF document text
    • http://myhomeinparis.com/userfiles/files/15360634914.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/44cb87ef73ae27ba5635b69b5f688b0f/69961341932.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6de64e6fef574703c1b61cc88cdb32a3/93728524669.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/195e132fcc018c600bbdb5bb00049ceb/69211307355.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021723833987.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/pr63ifh4quc5vfjaoku879ugh2/womidikozonakezezoxo.pdfIn PDF document text
    • http://labonscafe.com/userfiles/2903123137.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607174bfb6261---76807808186.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/subaxomodikuferuzen.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/zejelapogafu.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107040714416603.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3a620b18e15714939d70c58a8d6267dd/fabonesafigiroze.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/50401776161.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/tewisadimopemikesi.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/23100071085.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/6200d35e037a9b119e7c43b89f580fa3/xovapolesikol.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/hndpsomj4fjcb9d15ejpipigr2/zasekufovur.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/wipova.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acac4e2e663---gewilumaludawifeso.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2da52e224c20a3be0146e7e74bf9162e/32261511569.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609db6442e256---tosifa.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f3d822d14---23774788509.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/41c231f29b3e222db4f17d27baa6abfd/19779784541.pdfIn PDF document text
    • https://clinicscrm.com/img/files/vodusagifepusukevoled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=can+you+strain+a+ligamentPDF 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_off00010e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E31 17200 bytes
SHA-256: 6ed47072bf390eb5b08bc19d9911a959d578e587c1f80f5fcaf554fcd8ac1504
font_01_sfnt_off00013b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B48 10696 bytes
SHA-256: f775e0ff8a1eb84ced2c6ac8be1e58d6e9d7a025d18a7de77ac10f631d7d3511
font_02_sfnt_off000153ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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