Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba05687aed95783e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-30 15:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cd8812f9137ed130791aaaade47b493 SHA-1: d1f5151bd789f7e8fcfa9bf56b435446b7173cd0 SHA-256: ba05687aed95783ea8ef49255439069cad94ec2891507ffffec257e411073412
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, many hosted on what appear to be compromised CMS sites, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://catamma.ru/uplcv?utm_term=victers+channel+live+malayalam
    • http://www.insight-assessment.com/ckfinder/userfiles/files/86892175445.pdf
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/34169473481.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155847a8b0e5---36104881346.pdf
    • http://tzsunup.com/upload/75278693913.pdf
    • http://sdv.sk/userfiles/articles/file/16453960753.pdf
    • http://julianina.de/upload/file/99251644232.pdf
    • https://austarpharma.austarchina.com/upload/files/48853923968.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614741368d7ad---81155550852.pdf
    • http://haki.vn/uploads/files/vawapopupi.pdf
    • http://gunjanjain.com/app/webroot/js/uploads/files/44618800030.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/097b724aaa66bdce67c896aeb2bf4019/10108179985.pdf
    • https://istanajp.net/contents/files/tetolidabagudifoja.pdf
    • http://www.fuchingrading.com/upload/file/sekenapipaxumobudevoz.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/9e645915619029ee43fc47889cded751/53670673840.pdf
    • http://halmar.info/userfiles/file/pimejopadarizifekekudor.pdf
    • https://gsc-tw.com/userfiles/file/29766667603.pdf
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/78540919818.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/48469ce983017e7a028a185970b7dd5a/vafidonolile.pdf
    • http://chinalabware.net/d/files/gujojavurakitunevefava.pdf
    • http://mtecommerce.it/public/news/file/37291723965.pdf
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/vajenebobebelozinawopo.pdf
    • https://tiklatakip.com/calisma2/files/uploads/kidemefomeridenirapuvikas.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/91572318247.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a1551b464c78d396e9c01e85e14b5ade/8742619328.pdf
    • http://slr-eyewear.com/slr/userfiles/20210927124557.pdf
    • https://cyberbirddog.com/userfiles/files/bosevo.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_off0000ba23.bin
5a607d3e05a93b9c22ce0d958617d6d6367f690a56b1ab903e7914c75bb3f53d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA23 17500 bytes
font_01_sfnt_off0000e68d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 16792 bytes
font_02_sfnt_off0000fea4.bin
e2766c5ac17ab42409f75c1f733b9e4ffb420482d02c843c830c6ec9f5807121
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 10524 bytes