Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfb8de2a91a28f8…

MALICIOUS

PDF

84.1 KB Created: 2021-06-29 21:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5401efa1214d906c9ecb645aeccfb04f SHA-1: 51dffe0c756a830773a7382c4ff2b34505994e13 SHA-256: 6bfb8de2a91a28f89baffe81d3fecb91a1f90f88bedccf863a38cb286c29354b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs, many pointing to potentially compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters indicate a deliberate effort to distribute links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://mobilenmr.com/files/files/nevufefatuku.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ac289e12f---31100649799.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/d93621349c4f54c286774fbb04f6a63c/95813429799.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609223db6e7f6---sorilemola.pdf
    • https://manenshop.com/upload/files/26909738709.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/86972736362.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf7de8ea77---75859098765.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d6ac09c1f---xemivevuxomesimafet.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/bb8ac2fdb4c38fed5bc0f4a405e40e4d/dexuguguvumuvujazo.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5e029a461---zugezenatenopurelut.pdf
    • http://csc-020.com/userfiles/file/20210607060350_29ar5v.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef73189569---figulu.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/48786867328.pdf
    • http://magooferta.pl/uploads/fck/file/51742662468.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/puniwifevusuzigogutifinik.pdf
    • https://daynexweb.com/upload/ckfinder/files/70875740109.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9lmvaol6q8drs7k0c35p2i4p9v/77126754736.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1b96093df---kurijavituxosixuvipedopek.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efa3f92151---murepurunigojuka.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/299c4221470a909a530daaeb169a1c33/52928112926.pdf
    • http://supermarketdv.ru/files/file/pubarogiwokuvumepub.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/ae1c1ed585b95c8916900f68b0f32433/takom.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/090d38f110a1c065e681554e40f7114b/sozotunobosopatufimi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=marriage+biodata+with+photo+format
    • 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_off0000e5a8.bin
2295e9fb863dcbb35172774f5cc6c0c4c68eadf334b4bc259a09e8cd25f71c4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 10844 bytes
font_01_sfnt_off0000fe52.bin
1833169a292a85ffa8ae9a97d5b92e4935abd83f61da30cb1542c12ac9a4c0b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 17120 bytes
font_02_sfnt_off00012b47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B47 16792 bytes