Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d79db94b65f11e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 02:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 05e76449b1cc8db76978bd104257443a SHA-1: 642ca50f689767e14ea0376e0e7e95bc803018ba SHA-256: 25d79db94b65f11e042107e073d6477b889234d811dc70c8cdaa12cfa16116bd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It impersonates a cloud document lure, a common tactic to trick users into opening malicious content. The presence of embedded JavaScript suggests it is designed to exploit vulnerabilities or download further payloads, aligning with techniques like Spearphishing Attachment and Exploitation for Client Execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/2a3k6olts0hvanpoks6ik27677/80285933774.pdf In PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/migewew.pdfIn PDF document text
    • http://njchemland.com/upload/files/86424174842.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/tugigagupimere.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/muwirevaxuximakigeku.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/vovali.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450c43eff27---54251602544.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/38251676374.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/41743652125.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/91163574464.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/rejisofoguvupepaja.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/98774982909.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/62991341588.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/12565574117.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/92669865196.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/40568340494.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66175010082.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210901065013.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/zuworewuvagodatetiku.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/jilumi.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/leteninotogusuginafav.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/turusupoxi.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143200316718---20317286152.pdfIn PDF document text
    • https://avflash.nl/upload/files/satavororozuxutowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+storage+full+otherPDF 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_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 10712 bytes
SHA-256: 0a743524ecd0434864c7788b4bd40717bce021b65508cf035bb37578378d67a8
font_01_sfnt_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 17668 bytes
SHA-256: 10fe98a4920e2ece2a71fb17bb810bcf42a0a7178c8fb6f82760950149436605
font_02_sfnt_off0001264f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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