Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c46e4247b2e121…

MALICIOUS

PDF

174.6 KB Created: 2021-07-07 11:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdd4bd49248e40ba324807c09f9dc46d SHA-1: bf2bb6bffa798defcac55a4647a1249dcb1168f4 SHA-256: 26c46e4247b2e12121d14c60594425631dba6e0cee768781b2622dd469d7fa77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The high number of external links, many pointing to compromised CMS upload directories, suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=ancient+medieval+and+modern+indian+history+timeline
    • http://dekoblickfang.de/userfiles/file/76639760349.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/es4gh32olcpqvj1em6la0p7rgq/39126114108.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/78ea13e0c99e460d68e0de8d58596cca/zofumi.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/s3543k19k8dg5m79r6sh2jhcd3/49414152790.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe67a63ff3---kezonufiguwimur.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607525611df93---75935838992.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868feabdc58---taxiruwodasavet.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16077b03915030---72294632971.pdf
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/mixenazepopivemimim.pdf
    • https://247christianity.org/fckeditor/userfiles/file/635455132941625417114.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/nmnrd8kagfd5m25feljcl2kt51/xuxop.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/46a40ccf039cd672ffbfaadf6800860a/nosobeku.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/trtveqdi8srb4t0coql5haqksa/lewedawubosinawazawofe.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/afb4763b91f8906f5b6064a1ddffe66f/90786455284.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988da9b5f75---goxaniweju.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088bc632b36a---piponavin.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a5f46fd561f33a2623cb710695dcb053/fesepiduwo.pdf
    • http://lblussana.it/images/file/wopefaribarikixatesip.pdf
    • http://viprealestatebrokers.com/userfiles/files/66021347694.pdf
    • https://francois-daulte.com/ckfinder/userfiles/files/xakosafekebodaziwatuz.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84933751050.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98694372606.pdf
    • https://petala.gr/userfiles/file/76042341778.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a0dad404---buvikugezosupejugorerum.pdf
    • 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_off00024d98.bin
71a1dbc8e6f083c01f5f606dc2f24ac8ed47551a575d523b2ebf36d72aad0764		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24D98 16872 bytes
font_01_sfnt_off0002797a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2797A 16792 bytes
font_02_sfnt_off00029191.bin
98fdd097f519f07232cbb4a20ffc72421433a245cd6e7e592f416cec7bc9460d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x29191 10796 bytes

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