Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9dcab0043c856c9…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 05:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d1c21aaa3a34127995392af2101bee4 SHA-1: e49b1d93ddacd234590a8cc24a95b699adde3ee9 SHA-256: e9dcab0043c856c9cf213e273c9221bf8bf39d6934542e7afea4c0ed25a1178f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://undergroundtakeout.com/userfiles/file/jaziniworekibolowexuja.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6156ghrb5hgbtdkj0g0sinvtj4/fesoturu.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/zabevebari.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614411fb62d65---43821219623.pdfIn PDF document text
    • http://m2m2design.com/userfiles/gutipojig.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/46797482329.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/28435940448.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/77972357078.pdfIn PDF document text
    • https://premiersuli.hu/files/files/punivazaxotazekitadumej.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/59033056342.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/zojokusajozobefebazuk.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/lilefelikugomesado.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/27761772080.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/xupurekepovu.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/89375711537.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/80972071187.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/gojilerivudukisaban.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c051403e48486b4e6bd3991727cec771/penilibaj.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/10036081396.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/lirulige.pdfIn PDF document text
    • https://ratodua.com/contents/files/mimigepurixojexogafuxesuk.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/perugesokefegufonava.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/24601596243.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/melowiritapukikafep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mitchelton+brisbane+postcodePDF 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_off0000af97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF97 10744 bytes
SHA-256: b85ed9d3e1cd338720e834a5bdb8d4c9476592eb59dffe58632757fcf0eed878
font_01_sfnt_off0000c803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 16060 bytes
SHA-256: 5da014fa217c95e4b86fee2b2860bd484392b4eca386ae3fdba9fad7322ced0c