Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0eaa1eadc75cab…

MALICIOUS

PDF

77.9 KB Created: 2021-09-07 15:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cf5e94f088eb4c4398edcaf547d28fb2 SHA-1: 0db9227c55f229a4bb0a666c209ea2fcd8b3b79f SHA-256: 7b0eaa1eadc75cabb8319c7db13cf1eb95fc1fd784954ac37730b6bce26d2eed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=adobe+livecycle+designer+xml+to+pdf PDF link annotation
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a3710b023bf6b4f2d152633fa6727e16/begukimadavoleku.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/40603284638.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/23f8ce4c010d3e3c87cb4b0afd3d5aac/71106690807.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/risomarevuwodokotopala.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/81499098928.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161025bcb8532b---dukujubonogasoxebezik.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/lojabafigope.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/36097509309.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/5oqg5cfd85fsoiidh8j7idfnaj/12232918838.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9e20b73ece8041f9f151975501d46aff/potidukujofe.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/14574188151.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd16565275e---dumudimogifufebe.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/kijelulafozabidogudo.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/92622439345.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b6ff0374370ba16315edba91b120b709/32968205231.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0589bc73d7---powewum.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d710a24bc---sagud.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/37074337927.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/negujegi.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/56433082006.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609133c98cce2---86411965479.pdfIn PDF document text
    • http://proxima-design.cz/files/file/robedi.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f43ad15de9---kodevogasafem.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_off0000cc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC09 17056 bytes
SHA-256: 8236a281e73bd47d55572ef9884fc563b8a7ec127be3cd931634c14760c2494f
font_01_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 11204 bytes
SHA-256: 9dc2f559ca9eabde96e74bef030b63cc800d376b54bd09b16f91a8443ae976a9
font_02_sfnt_off00011211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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