Malicious PDF — malware analysis report

Static analysis result for SHA-256 4057a1e494173aa2…

MALICIOUS

PDF

88.6 KB Created: 2021-08-03 18:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cde9cda6ba878dbbfcfd4ffe36183a32 SHA-1: 31190d65b2444d7c0629963c840dc90580ac2aba SHA-256: 4057a1e494173aa265abf8e3ef49b7ad94c4cd165742174ed7a79edf869fe3cb
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, directing users to various external websites. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://catamma.ru/uplcv?utm_term=you+don%27t+know+js+2nd+edition+pdf+free+download PDF link annotation
    • https://saksisan.com/upload/ckfinder/files/dakazofesowodoxukuxozorum.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/e81jug03ha5npbp8pmgjnllele/xotoxuta.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/vujerenigiz.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/75209216456.pdfIn PDF document text
    • http://fedime.org/imagenes/tefifalaxegegixeva.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rurufidigamagezegepi.pdfIn PDF document text
    • http://accronline.com/userfiles/file/nagazogawugitovilofate.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/7869368450.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/vnlcr94bd0oask7usmb9ar33iv/42211944421.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/xuvokufelo.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/29016400228.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b40eac13034---18798101002.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3f0cee01d---12203796433.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/982933344282dbc8bc186550aabd0689/musuraganuxagojoliti.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/75641d6273f53ee5306593fc5b70ea08/80731469847.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/pamisalenomadononuj.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbba1e4ee2a---dejijani.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/wixebam.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd5503f1c7---zonalizuwodozu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4954e2cbbe520f761f6b776d472bc0ea/siforuvivudeveletimiburaj.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/razasoluwapedovibojulu.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/gusosoxaraluja.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/3dut4g6a4jutlp4t0iudjok5vj/kagefi.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/jixiborulun.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/banakokijojanixinirerij.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/gajupeguvumiro.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 18652 bytes
SHA-256: a83b2cbd99b76db081d26354ffc54b0cd91a26bd484fe018ce1fd9aa68a9d721
font_01_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 11036 bytes
SHA-256: 3723c00b11e1161c332f4799b97900333e18bdcb536a51e16b3dd66bd6f28625
font_02_sfnt_off000139cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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