Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ef4ed7e661ddfe…

MALICIOUS

PDF

89.1 KB Created: 2021-07-06 02:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2284a4634375f5119722e648a775f5fe SHA-1: 87a8ebc36b0686603926f9acd5841fa953344d71 SHA-256: 03ef4ed7e661ddfe3f8a5883d5ca2bbbd927e13b8feaf814d62e0078e7dfec71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF. The embedded JavaScript likely serves to facilitate the download or redirection to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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 http://fratellilongoni.com/userfiles/files/50554773137.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/65540669669.pdf
    • http://aplus.to/userfiles/file/24502939669.pdf
    • http://danieldesignpro.com/userfiles/27435967244.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757975448ab---tobekigevofir.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bda97e667---56641625762.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd0bd203d8---59855989282.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ql9mpja9l7805v6hkjnshloj92/65356363671.pdf
    • http://goldnumber.info/userfiles/file/tugaxozupuniroxir.pdf
    • https://satybharat.com/ci/userfiles/files/29998648291.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c17cb7fe55---xulorapepeti.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ddbddf7e0---65683164624.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3554b95224e78b73b9aa0a9a974a5706/17660524262.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c9152a2d2---vikezonelevewal.pdf
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/61209225779.pdf
    • https://aprilboya.com/userfiles/file/sudelotuvesoremekogase.pdf
    • https://resonanceacteurs.nl/userfiles/file/66446711633.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081702a083e1---86968933562.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/cuijscmlei0fig0jke1ijdjqfg/makaveworelamusigutojum.pdf
    • http://the-bom.kr/upfile/files/xosofatomibazubov.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0d8d5ca0e---kumugaj.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906ba1c80db---kitive.pdf
    • http://placc.info/up_image/rujadisuruvodatojen.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e6ca752ba---70237248460.pdf
    • http://marthomaiticherukole.com/userfiles/file/88708856101.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=diligence+with+focus
    • 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_off0000fad0.bin
28d366112477b8c3cb9e64967adf5c8134f67c4b9a61bdb879c8a423bc03abf9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 10540 bytes
font_01_sfnt_off000112d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 16792 bytes
font_02_sfnt_off00012aeb.bin
e91e193f87f7ba99ad9cbf8956dbe8f3dfd114d883ef2847458db9deb475efa5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEB 17912 bytes