Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc76406d20d9ae4a…

MALICIOUS

PDF

86.6 KB Created: 2021-07-05 20:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5905f0bab870372b86137d7378c54ed SHA-1: 02c1dd78bf464b9255ab241c76d88f48a940a429 SHA-256: bc76406d20d9ae4ab02124093ec0487b9b201faac44ee89d0742d0a8842f7169
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload directories or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://greenline.bg/userfiles/file/83975382707.pdf
    • http://ampletrekking.com/userfiles/file/57820566311.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/fimakolarusozus.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16091acaf7cc2c---netikosapezolepiboxuwaner.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f41c2742a---tutozadeda.pdf
    • http://angelescare.com/userfiles/file/24603906245.pdf
    • http://krakow4you.pl/krakow/files/satenabelelekakadel.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/72fd65d12ce9841d7fa54a94980fe360/45314663219.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/4k6rj6b9c48801ejr4dahk1sdj/kedemixis.pdf
    • https://cmoretv.com/userfiles/6295712589.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/535c5f357c96101132e7e5464e446571/xozosumasajepe.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/sclptotjmhvv5hoddul6k01qtg/xixilamikanodarakarelonu.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qj722sf5kf0guf4d5lb7pb4622/81637343273.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/disudedurovarof.pdf
    • http://cosonhuath.com/hinhanh_fckeditor/file/10801438543.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160749980304c8---78377425850.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ht7jtbc7smcoi21ioegnaig4e7/26820071756.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/91313288b3d567a33f877a17433a972e/nagojinorowifofigibuze.pdf
    • https://audit-advisers.com/userfiles/file/wanurimajuwumu.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160943affda121---23532662810.pdf
    • http://prime42.ru/userfiles/files/forepojutasudutezan.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/d4d7j0kesackosic9mga7l1m30/36584456781.pdf
    • https://sasalidayanisma.org/uploads/file/39351549103.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=story+of+rachel+and+leah+in+the+bible
    • 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_off0000f03b.bin
776698fdd5720ebac71364788b0bcc4933eea9a673cd5f59225770af108d77c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 17092 bytes
font_01_sfnt_off00011c8a.bin
b7b75a013df5cdd2f32bc85ff7b4ce61310506aa8ec6c013d3a0b9b8ab1394d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8A 10732 bytes
font_02_sfnt_off00013522.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13522 16792 bytes