Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de31cee3c6457fd…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 02:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 276600dcee4dabb13ce944f6150c88fd SHA-1: 593e7ea56075ee0717dd28d687f00a01620ca7d8 SHA-256: 6de31cee3c6457fde63f1f19f64d438ac171a1db35eb76096c725d20c3bfbf10
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs that point to external sites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an intent to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=sobre+el+hinduismo+gandhi+pdf PDF link annotation
    • http://agataklimowska.pl/userfiles/file/vepubadaduz.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/wadoruje.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/104f668bb8e64ada1a0f5e712c8da9b2/90134860067.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7458979e95---watoxeralizupowib.pdfIn PDF document text
    • https://actor-conseil.com/files/file/zanuz.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072f2b8a1d5b---dedutijogejuwisoroki.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/sawisemedo.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/pmmr7ie0jmn5nr8dduvdcat4fi/xuzemabogubis.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2082b4f58---54471592809.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/69226926481.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38f1cb234---20838047993.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/20819e73dc5350f0d46dff105bbd5b6d/7993325558.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb838094f7f---zopifagaxepesulol.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/91614557450.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/qffnbds0c6dih3u887ruermt01/tonavejov.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/kinubetanut.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e168e47e3d---89372174942.pdfIn PDF document text
    • http://superazs.ru/images/news/file/6664513639.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8be37970170f64a790a7a674452d5ace/kasolizanijepozifiwo.pdfIn PDF document text
    • http://darstin.com/userfiles/files/53048190621.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/mozeruruda.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/0f7217527b82ddead84ecdcfb2e6841a/juxusajunipobetodekaviju.pdfIn PDF document text
    • https://filetorme.com/upload/files/jamilanutamup.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/vadibdv9e6hk0o7a01cu6bp4l0/posoziwusekimimukowap.pdfIn PDF document text
    • 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_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 11160 bytes
SHA-256: e64f1561ca684bbd4a1c7b0882c10af9f950f24ce12db7fdcefc335c296733d3
font_02_sfnt_off000119be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BE 18992 bytes
SHA-256: c11981cc4960fdf97840e872569f3e551a8a5b7891048404648a686c664952f2