Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba74811115f8339…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 14:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e53e47da46d2ecf986bafdece01823f SHA-1: 7ff388254bd033bf723a5404dd2004c6b95f76ee SHA-256: 4ba74811115f833963ece31a2a43af82b59d59babd17f292063f3ab4190f6fc4
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm heuristic indicates the primary function is to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://warungmimpishio.com/contents/files/ravodupuforoni.pdf In PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/livazarexogotuta.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/22316e01099ddfed43a5a575091701dc/27230079126.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/52120363617.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/50705543817.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/wajakukalureke.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312f633086a---12212792265.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/76185123237.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/pulovuriti.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5eea505ef184770e066c241cef83c081/bepefokozeparu.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/losazujajegenewifis.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/jirutovafobe.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/37458217952.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/godosawov.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/35243069440.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/10539111182.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/lorutasakanetufi.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/tutupozijetazelunovumov.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/tesoliwavukijadilusanupa.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/99002807899.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/7314f3df7e8b884846f34fd25c164eb5/55082581292.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/koweduf.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/jubawowelowefufizoda.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210908021610.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/motebo.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/12601468939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=best+price+mobile+in+nepalPDF 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_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 10728 bytes
SHA-256: b298dd7c5c713f05ed33f89aa6650d8a530e3c01c271a9f74a0180136509718a
font_01_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 18260 bytes
SHA-256: d1d089aefc5c1176d5479073250753d80df83dfb8329ff20553f3e8dc78f8279
font_02_sfnt_off00012ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1