Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1802c0e7ca1e15…

MALICIOUS

PDF

86.3 KB Created: 2021-07-19 02:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8655bab454a0feb166efe43827b2c9d SHA-1: d3a01437b4eabb569eaa1d9189b645825f4b03a8 SHA-256: bb1802c0e7ca1e1541c3bb3758576b8fa88761dabeb004d81f6600408e8ad7a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f02784b164f7a4e718cfe89a69e0c29e/sigeposibarakuguvorosu.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3a5ea33f492bff8ccc397575c1e08351/memubutemalemig.pdf
    • http://richardchong.com/userfiles/files/58256678720.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e1cbdb75---73868029132.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c557361252---gisosawukojobupe.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/81245657633.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/qm46hgh1vactv9i5j77olf5d96/42516997009.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/3da841cfdb55dfa53e5ec26ff99dbc97/netuzal.pdf
    • http://atomleasing.ru/media/File/28854021499.pdf
    • http://palyavalaszto.hu/teszt/upload/file/3132382787.pdf
    • https://daks-96.com/f/uploads/files/23254745240.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf7ee78cdc---47767928117.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/tagemubexipojewubo.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/a2c4a68ea54bef81214f52abf1812b1b/99583113318.pdf
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///20216191744568767.pdf
    • http://studiogallerani.it/userfiles/files/32756897787.pdf
    • https://sportsht.com/userfiles/file/40493519524.pdf
    • http://abwmarlboropike.com/uploads/files/wuvapa.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccdf5d27cf---3239897259.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f19773b7a71---bozazipunoluzokoxukeva.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/negixowipusenapewab.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160799ff97419c---begikoruwurifovezivuzaf.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b9e6c319c1540af8c8ba7fb20599c4aa/22645727245.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+colour+is+your+personality+quiz
    • 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_off0000ed7f.bin
56a2ec4ed041e362ad24b660a159937c40cec0e60354ab8e8395fbf56c01007c
pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 10884 bytes
font_01_sfnt_off000106bb.bin
9719082fd0d35839fc164e6b1425c02a95f49b4134db3dc3445a720f705ca7e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x106BB 17408 bytes
font_02_sfnt_off00013418.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13418 16792 bytes