Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7de40388453d7ca…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 20:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4521b4a36394dae5d95f19eef47eef08 SHA-1: 29318e51cf0693c2af05c57d0c5cef06ae6813b1 SHA-256: f7de40388453d7ca43c60767cb41fedb637d655fd43b52e115e703b1c79e6d08
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many hosted on disposable domains or compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious content or further download stages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely 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://singer-island-condos.com/userfiles/files/51433060627.pdf In PDF document text
    • https://robodom.si/files_vsebine/mutexeremumivirinif.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/1533049387.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210907211624627.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614338c75de28---dupijavemewomemu.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6a54cacf---27428534982.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/vixijimi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd74bc8880---83300312570.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/pexivulejaruzenazo.pdfIn PDF document text
    • http://contextuae.com/resimler/files/89546530452.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0e1337c16---88030451092.pdfIn PDF document text
    • http://grossbuch.com/upload/file/xatewu.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/95995238991.pdfIn PDF document text
    • https://akvaguru.hu/user/file/sepizemawi.pdfIn PDF document text
    • http://slsnn.ru/content/files/1352857807.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/rarovebitexefi.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/sevij.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/zelunilovovilirukepe.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/kafawuf.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/jkmr26g5pim02ubnqh1dltas7s/zowodupusu.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/livedefaxawenun.pdfIn PDF document text
    • http://m2m2design.com/userfiles/39872644884.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/21852764954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bxactions+pro+apkPDF 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_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 18348 bytes
SHA-256: f2380c641ee8377808d19f31a94cfea12b41cf3ba5af758091a1823c3a8b73b0
font_01_sfnt_off000110c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C9 10436 bytes
SHA-256: 8ed40fb6008acf6e04b38bd96fbc7329935676d8297875db09ae1749cca970d6
font_02_sfnt_off000128b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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