Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c17068538bdfe7…

MALICIOUS

PDF

85.3 KB Created: 2021-08-19 09:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: ef736df4fc327b805ae1366439e31b7f SHA-1: d35eed0b68b4aa61e1c12983f9faa83379c0ee1b SHA-256: 23c17068538bdfe76a3d482269e6f8c655f19d4a7ed48842ca498e8693e42cd3
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/14748040308.pdf In PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7184bd377---gumowugop.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/60533856807.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3db274d7fe---73233521486.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/sozenaberuxu.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/36508387978.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6384b2a272---72663027395.pdfIn PDF document text
    • http://toonesk.com/upload/pamuzeb.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/27763963320.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4dc83655c---37764720472.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a133220689f---tigosuzanejamabibiwi.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/kekezaginuforemewifemel.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021072313503253979.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/51753214669.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/40722526935.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/5513113374.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e13377681be---96125144006.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/85101173357.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/18726022143.pdfIn PDF document text
    • http://exosushi.com/uploads/files/kumexamu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0f7a1caf23512800a573b8d0a3a4823d/68740855554.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae7941c89e---57278781900.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d3806277709---80129501347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=kenwood+tm-v71a+user+manualPDF 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_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 10696 bytes
SHA-256: 688055fd271e524ef4232e388756ab39860da4add5fb7abff9bd80c93580b336
font_01_sfnt_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 17600 bytes
SHA-256: 6a353639740e0957e4d224fa95ac2174e15ac2b0aca07e31136c1eb9fbb2a62a
font_02_sfnt_off00012e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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