Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e82c9b06439c5cd…

MALICIOUS

PDF

97.9 KB Created: 2021-07-31 19:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f0012f32ecf8380fc196c5fda34b29c SHA-1: a843770228a2b8bfc59a4c339933d5e59ba2a498 SHA-256: 8e82c9b06439c5cdd22a9c272a9ff84cfb6383e12106ebb251881c2639b7e5b7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised and disposable domains, a common tactic for distributing malware or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF link farm heuristics confirms the nature of the document as a lure to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bigxra.com/uploadfile/file/2021052719511773499.pdf In PDF document text
    • http://csc028.com/userfiles/file/20210628014827_njh8ry.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/50485842807.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/rareguneda.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16084adc683b6f---toretaxuj.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/79282083994.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b48a9f1a1---lomonivowifofosopaluperap.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdda315dba4---novitokusasajamigogikafe.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/zabumaziredakojubi.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16262092559.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/pifudavewusafavanozeru.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160816200782b1---54933030786.pdfIn PDF document text
    • https://proxus.nl/file/88728366618.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/gobuwuf.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a36430664ca---78553510736.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d65749a8b---73830424452.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/31ba64c7cbdd59bde1dec2f2a73812d6/ralitavusifewisezoxi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8744b2428---23657820280.pdfIn PDF document text
    • https://bamor.org/userfiles/file/forifonozorin.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/metizawevegi.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/96145054855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=can+you+watch+bt+sport+on+sky+for+freePDF 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_off000118f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 17860 bytes
SHA-256: c6d7d9a42dae959cc38e1c1be6e075c3c025480c8944818065e3ef6af1d21607
font_01_sfnt_off000147f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F8 11000 bytes
SHA-256: 487acfaf9de71c8f4a5e92ed604c4b06dfb53220ced830a5fbe9f1ade8fe4e92
font_02_sfnt_off0001616f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1616F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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