Malicious PDF — malware analysis report

Static analysis result for SHA-256 b252860f969ea815…

MALICIOUS

PDF

77.7 KB Created: 2021-08-12 23:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0c846a5f2b2ab84f434aa75c968f38f SHA-1: 05383aa6be08714c38544db5f97d28a72172938e SHA-256: b252860f969ea81536bb51d684577e8f4b7f97d3bb2b951d22e8ec1006bf0797
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, pointing to numerous external URLs, some of which are hosted on compromised WordPress sites. These factors, combined with ClamAV detection and ML classification, strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=problemas+de+matematicas+para+sexto+grado+de+primaria+pdf PDF link annotation
    • http://dragonspond.com/uploads/files/belidirur.pdfIn PDF document text
    • https://pharmalogindia.in/ckfinder/userfiles/files/madovajujokitagem.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97126bdfc---pifufesesi.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7af6da453---nukumutufesidapilejagep.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/puvizobakarodorakagekufab.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/67123783622.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/3780244179.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/57968090377.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02467a2eb5---91165359506.pdfIn PDF document text
    • http://unseretochter.ch/images/file/69706853157.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/4a3eecd68cd63897919c5df73b23d340/50419357355.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/17lkim5894cku88rvcv7eohi4t/16230751774.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b639062d880---39858069938.pdfIn PDF document text
    • http://yilip.net/userData/board/file/22368547818.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/gibefuvokegozowomadanom.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/ee69106a52047558296faa0ec450bcd9/91511491203.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086460108f89---58189825515.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/35243584324.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/045869a5428a0f12687dcb749b90625e/33337993946.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b66842b85346db94df5d88e88c2c8417/48966158392.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/35103666867.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/14268993790.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b59d9ef47eb086e2c79c0c2dbff26b9a/tudekiwupanedesobuwami.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/16316220720.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_off0000c823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC823 17468 bytes
SHA-256: eeba2a0a113638aa8ffee62586976d1cab44bdb8f474eabfa92215f125a2ee51
font_01_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 11100 bytes
SHA-256: 82846b0a5def8151752d4a2989ca7baf3fc658bc356bf32dd5632aaa7769f7f6
font_02_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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