Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4e1459151aedcb…

MALICIOUS

PDF

79.1 KB Created: 2021-06-19 02:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01246ba2b40ea717d3ffdf0fed4cd855 SHA-1: 339fd8c9ed8e7a85b59b7de414264658005c9f8b SHA-256: 9b4e1459151aedcb6e9bb328b6b7370ab01c0c88e4a07fdf21a30d48ff593c60
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/3msbl8t7uleddsd0qsqk2mi0d0/dodabinufanepebene.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c309499e56e---labodawofugunitesubeli.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/osl0eag1490ejpcfg2c73g3tm7/juxakewivesezigorawam.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d1daa33af---68488933076.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/u014s97bmt121t736et5jjrf15/25527672594.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d796b42530---34683594797.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d812c692d---togisexijobuwil.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2785f444de25c644a80e604e4d97616f/kuwigoviwezikera.pdf
    • http://adance0112.com/upfile/editor/file/baxerapoza.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098392b46d25---famakikutefemofuberi.pdf
    • http://dush-kz.ru/uploads/fck/file/javawiwefogaxetuze.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c05accd22bb---89648552374.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/leligelaxosideruxomo.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/b06ihpu94954db8aoius7n182k/bavikufozironuvizub.pdf
    • http://aylincinarli.com/fckfiles/file/44576618782.pdf
    • http://backupcenters.com/userfiles/file/ludijana.pdf
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/xuniwegejitaramasek.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e300b5fc697ba25a1031cd8e5a0ee492/nenuredakerugiwadijuto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bsc+3rd+year+mathematics+real+analysis
    • 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://scripts.sil.org/OFL
    • 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_off0000dcf9.bin
36196db3830e1290a1e15b24c9411b3e366fd03abd5dca1198517aa727905cd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 5496 bytes
font_01_sfnt_off0000ef84.bin
199b8e2249b61d29c9a75952fbc4dcd8ac6cc42f884bc6d88104052bd3ef3703
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 11860 bytes
font_02_sfnt_off00011874.bin
3a14663d4dc44c652704040c8ab4741fad99658ee5f51a5d13c7eda5dc3d8f1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11874 16444 bytes