Malicious PDF — malware analysis report

Static analysis result for SHA-256 106af52cc74d0f1a…

MALICIOUS

PDF

76.8 KB Created: 2021-09-05 02:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 6e9ba8e8fdbf2b0b552d4f2b5fd71c84 SHA-1: f03739de9602b06f1f2445a0f0bcd08ff92077d7 SHA-256: 106af52cc74d0f1ad0baa4f3af63346def314edb757039b33b70ad5c55d06a3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/k4eip6dmo2f045cu34d4u6n0r3/wifexigopupudalelaso.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608e609f151f3---67432199886.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/449783a190413efb670268b72d44fdca/9666949658.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/53428560600.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/tunavasotaw.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/womiwegoz.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/11353023080.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/34e75846fed3cfdcbc14a439da7d88cb/8903802615.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/7667986756.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/30109204447.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/24698497120.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b07e17e49---pimanobixonomujapotipofir.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/20627454213.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/95730016148.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/98470995786.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c074b262d1a---lotutapegezamanowot.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/jusatidi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b950c3b1e1fe40b0a1d4802478405565/xubelufagidusonitavisim.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/t3qbabvedjv5j1stgd6ko407u7/49842175993.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/mprs3kk48atp8dfmnq10pu1sja/simim.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/39231412779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=mapa+lisboa+centro+pdfPDF 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_off0000c462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC462 10744 bytes
SHA-256: c76edf05d1b105cdfeb7719fb5e306834f208b8e55dce244b0d76fda0d96fb04
font_01_sfnt_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 18716 bytes
SHA-256: 28671a7ebe815519b86aea038f8a6c236978b9b4419591c164b21bf2fb6f4a14
font_02_sfnt_off00010dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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