Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9ecf0f75c72c45…

MALICIOUS

PDF

71.5 KB Created: 2021-09-03 15:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9df9b2b8037ef13c98e307f530895653 SHA-1: 04aa6c9a42b7ae5673eed410260eaa32a3981ef0 SHA-256: 4e9ecf0f75c72c45f2460edea21913b7d1d2e653bbc6bdb5b1787707fe0dd7b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It functions as a link farm, directing users to various compromised WordPress sites and potentially malicious URLs. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a phishing or malware distribution attempt. No scripts were extracted, but the overall structure suggests a lure to external malicious content.

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 https://archism.ru/uplcv?utm_term=hydraulics+besavilla+pdf PDF link annotation
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/31d1d483f94332adf15f94fe9d97c88a/katusidibizizawolim.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e3fb5fe4b036aebe225b4ec515dc30dd/55859526721.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d6d763742860f6fc1e89a085b0e98081/30324353148.pdfIn PDF document text
    • https://polaria.cz/images/file/58655849533.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/qrtf7ko70om4a0cvjnblfrq4t8/xivefoguwuxovur.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/gg0s0p9jsjmjsm6oi9aunfgh8l1dj3eg/33373538024.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095c13ea5d67---68204421992.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/2090206543.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90bd4df93d---55827009991.pdfIn PDF document text
    • https://ikansambel.com/contents//files/84335138323.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/6915029103.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/xabolibalagoxotino.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33ad096a28---wuvamejekomowarevik.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/17951496604.pdfIn PDF document text
    • http://enewind.com/pliki/file/31903992562.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/30871441177.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f86cae581---gesaxugekede.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8e481475add035da54487ea8d3b32ba3/29621225040.pdfIn PDF document text
    • http://msiutilities.biz/documents/taxuwogiganijukopalamig.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/868h9ogg7tgqnginljmm8rnosp/mevaxebuwomepenujejesiwom.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/13261116978.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/zarerologut.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608384599bdc7---mifabejaredakalapo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9be9ba024---95402054306.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81C 15596 bytes
SHA-256: 03341ee322b90471587dece0ed3c0c3f1acd18430226ecbac8787ac6ea47bf80
font_01_sfnt_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 10700 bytes
SHA-256: 0a834a2b09b12306ca51a8c62d1bc66e933ce652574806133e52944593959afd
font_02_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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