Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5d1c99c7ae58a3…

MALICIOUS

PDF

85.6 KB Created: 2021-07-03 16:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89bc68748b85614fa1348b820329837c SHA-1: 5bcfb2df40cd899e3a2c003ac08fb1ed1b68b34f SHA-256: 1c5d1c99c7ae58a3c96e147ce45c4ecb8503bad9d4b09af7cf09e313d0c1ed70
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with multiple URLs pointing to compromised CMS upload directories on various domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of these links indicates a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/35a6982453abfe29602053085aed1f72/senolorakilanubinizugi.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/5punvl80tt5pq0ersn7tusd384/13173205867.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aec188edc---banijiwamenezam.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0a6c97ac5---libinunidikotopuwapa.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/43b1947rq7dcov716v7ivb74e2/1792420795.pdf
    • http://fine-cottage.ru/userfiles/files/4850253747.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/a390f79550751ea77c1222dd8f7ce4a4/jijilifup.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c335c8e17---wikazi.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/iejtr27t9i4ihfj10kiq4sgnn7/48699873700.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/lizebewapivavo.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/bijeguwisoragowiduv.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c429cddcfb9---rusosukigave.pdf
    • http://rallyteamwalraven.nl/file/dotorikewiduvari.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/gma32jgiidc9bf0u7fvadt0bh3/lejox.pdf
    • http://beamstraffic.ae/amb/userfiles/file/66640520526.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d6bd01ec1---69457832171.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ca3c8b6e6058aa16303ea20e93be15a9/bopul.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/03c81c3e21da9dead4789550f0dcbbb3/11422493932.pdf
    • http://canxetaidientu.com/images/file/92656810036.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/a197t43pnoln7ff1utg1u0dto6/kabusef.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160aa345f463e9---89715152860.pdf
    • https://ehlibeytalimleri.com/resimler/files/23075923358.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dfe10ef4c---batizedaduk.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8a8173cfadb209bea2f43b84c3e7dba3/boxinasuxomabuvun.pdf
    • http://mosvag.ru/img/lib/file/30485760452.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=used+to+grammar
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edfd.bin
e56bd5d7f29b25f36c3e26d0727b498cb9c19d0089d46762abd0ca08a3b1f6c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 10356 bytes
font_01_sfnt_off00010537.bin
4f26869726e3f0072368839fe9c661d722c4f2792f651491252c53b66e26bd60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 17016 bytes
font_02_sfnt_off0001314b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1314B 16792 bytes

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