Malicious PDF — malware analysis report

Static analysis result for SHA-256 46da063a6add7d55…

MALICIOUS

PDF

79.0 KB Created: 2021-10-05 21:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: faec2a5b69d0bd37023466fda8094226 SHA-1: 04b9284a15e298bdc331b1ddca52b2e75eef5aa5 SHA-256: 46da063a6add7d5562213d4aac44094a96e16d9a889e91b6fa4b8be34b3fe7c1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2e422959a---fenesomekidetu.pdf In PDF document text
    • http://www.autodesguacecoin.com/ckfinder/userfiles/files/98183576487.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/muvotigut.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc99245061---57266585239.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/28112450252.pdfIn PDF document text
    • https://agt.twwebmarket.com/ckfinder/userfiles/files/83330700162.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/loriruwasaxodunis.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/72154354971.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/nibux.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/45528397169.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/pagiledusurimuxi.pdfIn PDF document text
    • http://risme.vn/files/renidevetudiwitesadexale.pdfIn PDF document text
    • http://excellent-art.com/userfiles/71914035889.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/17280060326.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148665ea6a59---ligeborabefawenineniluve.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/vofisiloduwirupozeva.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631377116.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/lamobiniserexuw.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/40645385436.pdfIn PDF document text
    • http://pileki.com/imgup/file/diluragegizumatuvi.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/pujaruwikopejo.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/20530181032.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/87986029029.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/99674885059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+fat+body+weightPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF02 18088 bytes
SHA-256: 189e2fecfc17f0d8cbad5ec5c1f2c179c24612ac11f71f9a327959424ebe7624
font_01_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 10632 bytes
SHA-256: 7c339f9fe7f755230ef4a2bd661b7de8e4db297df361d4445834771e01ec1db0
font_02_sfnt_off00011643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1