Malicious PDF — malware analysis report

Static analysis result for SHA-256 356d88479416ae59…

MALICIOUS

PDF

94.8 KB Created: 2021-08-30 10:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 658b4faf255da60d55efc7280d4c084f SHA-1: 69fd4cb33cf649c7ab4c1357ccb2fd3b9acd3c17 SHA-256: 356d88479416ae59cfa562e7d48e281c49e07cdab0ff89d4d058c8aeed75327e
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms on potentially compromised infrastructure are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9eb436cb0---28191901570.pdf In PDF document text
    • https://mfdesign.hu/files/file/38398723937.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/93384880406.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/32229071264.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1040bc9fe4---12060548724.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8476d2bdbb---wotugurebaza.pdfIn PDF document text
    • http://industrialdevices.in/uploads/47602042753.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ca8d6bcf7---vebotezonelumaf.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd88cdf01a---56770965846.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/tajiloxe.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d81b71bde2---fowusesilamavo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac632f9a572---rexab.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c83585e0f---sesesiriwadisavajuz.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/b44e9qtripq41gg9k75oha2cok/41474670810.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/32438476548.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160941787e8a40---dojavubufagoweku.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/kogataxodegolotemi.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/bd419dbf92a8995d01358ff9a7b77e48/fajifatugifa.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/demuxasezebapavu.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/napetumedezepaxezidivoneg.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b2a7cc491---kazatotapew.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cbfabe0fab---kumoberigarurumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=intraday+stock+selection+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_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 18132 bytes
SHA-256: 9c41bbef5fa3b4cdce8a71012b6e385ed9fbfb45e3a0327583916ab72255d360
font_01_sfnt_off00013d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D07 10772 bytes
SHA-256: 90583b95b5a3e9735150307ffffdcecabd394fd2c3e87005c4419f62eaf4c161
font_02_sfnt_off000155f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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