Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f4dacc52d54796…

MALICIOUS

PDF

95.1 KB Created: 2021-09-19 19:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b47f24cb6cf95248760fe51866ce28f SHA-1: a7d3f54d6b7a591fef40ae06001ba8d1680a50c4 SHA-256: 54f4dacc52d54796f38697b080cbb91ac08bb7abb1aa75eec4aabb54cdf19a5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=best+processor+of+android
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7ad35cfad---nemojijuguxudalade.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/88l78h6gf8jclgmo4d0adrhfi7/40612508926.pdf
    • http://yomamasushitogo.com/uploads/files/29584511417.pdf
    • https://balmbeach.hometeamcorp.com/images/usr/dupesupe.pdf
    • https://qatarsecurityservices.com/public_html/userfiles/file/19968442177.pdf
    • http://goozzl.com/userfiles/files/wukidikerenejigidadatuga.pdf
    • https://preprodpcb.com/userfiles/files/jumorezifejebome.pdf
    • http://m-s-g.ru/userfiles/files/mesufafemolusetemixi.pdf
    • https://tivicom.vn/upload/files/fepinegekutemijopoju.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614090d158498---57213852622.pdf
    • http://bearings-home.com/userfiles/file/34164421086.pdf
    • https://immo-macedo.lu/userfiles/files/gegunirozojipuwuza.pdf
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/49074329021.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ieub02joki16n389g0bodm8jf9/36808267813.pdf
    • https://canionglobal.com/FCKeditor/file/tolovapeban.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462093f39ed---64390372423.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9023adf2a8fad63ffb12465fe5eccec7/gepis.pdf
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45604350310.pdf
    • http://enovosti.info/ckfinder/userfiles/files/56987724074.pdf
    • http://ippinnudon.com/uploads/files/warizubewujenutiwatudeg.pdf
    • http://pyhunlian.com/uploadfile/file/78588857718.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/a8a6fcca77ee7bfda1c1170eb5f4f770/walijubarixawepo.pdf
    • http://geodez.com/pliki/file/jopisotaditexido.pdf
    • http://www.gamylai.vn/uploads/files/71614873506.pdf
    • 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_off00010f16.bin
85b25949b1136fd15c0a53cfe8f982dc2d8f2558a4339f49335000bf7d0d296a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 10620 bytes
font_01_sfnt_off00012785.bin
9bedd12e307093c2916cf26a67199068aa1c4ce48e8a5665a2fefc5f57faea3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12785 18132 bytes
font_02_sfnt_off00015696.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15696 16792 bytes