Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb6fb848bebdcaf…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 04:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5de8092e8e47ab9250acc0b5da86efea SHA-1: 3cfde4143fb1469c16537acebbad6fc0650ec96b SHA-256: deb6fb848bebdcaf7773eaf1efc073a6c9083bd5a45f4c52fe92ebcf16a49843
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://att-na.com/upload/20398080072.pdf In PDF document text
    • http://jncs.kr/page_data/file/20210902220001.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/902bc82225d02525c8fd81e7796c0fb7/pipofowuj.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/raxuvo.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/56063403771.pdfIn PDF document text
    • https://network-italia.it/file/woladogoxa.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/57960805434.pdfIn PDF document text
    • http://uchid.com/uploads/file/25352522077.pdfIn PDF document text
    • http://belean.pl/userfiles/file/winud.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/3435759310.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/zazewakafuterud.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/83891764145.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140136f87a19---50848651180.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/kuvibefulutuzumemi.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/203a76fe55238d7a6b1a148a66851191/maver.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/49596278392.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/vukubugusurojerifuvi.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/92124277764.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/naguzetoxuxenut.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/poxefodin.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/38833844532.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/30670999171.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/bemonakotumomedatafaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mabini+batangas+zip+codePDF 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_off0000e06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 10736 bytes
SHA-256: da8e1a9e93385ce73de3395ace50a7a4326621c7a6c226df1f258648a371f7a1
font_01_sfnt_off0000f8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 18128 bytes
SHA-256: 0425d0daf7fd4638a2463bf1e5c72be551b6d64e2c7aca45789e1f8573859845