Malicious PDF — malware analysis report

Static analysis result for SHA-256 1539fe24522e6a07…

MALICIOUS

PDF

87.6 KB Created: 2021-08-26 10:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e868d469f12c5c2fa9ceed2b29d95f1c SHA-1: d237c40d50e47414cacd5dbefcf64b175668bb2a SHA-256: 1539fe24522e6a075b4136ba5811d978e94ee968edf424c87f063e2567501da8
204 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, exhibiting characteristics of a phishing and trojan delivery attempt. The embedded JavaScript and numerous links to compromised domains suggest an attempt to exploit the user's trust, likely by luring them into downloading or connecting to a remote-support tool. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://xn--vb0b83rba554gca.kr/page_data/file/20210520164419.pdf In PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/kositugigepowuv.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/xenowebikusapepawotidewu.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609502924fce8---jitanurixo.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/nebowamuvabapufitud.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd0b9b3dbb---84929534672.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db6ebdbfa0c---motipenudevuna.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/82521174277.pdfIn PDF document text
    • https://ancoraeducacion.com/images/mafawapox.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/jobijilugewaxusi.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/9825884610.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d62b75fde---kidunosovirupepizeg.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/seliwolodefezakutez.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/87525531986.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/6a9b1a259c1d51a06cfe02aa3142ce1a/32938093850.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/jewaranukifituzaweleja.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/wiropubif.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73c3520fa---27528581965.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607564944f7cc---55704211050.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/35166221824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=live+player+footballPDF 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_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 10356 bytes
SHA-256: c0fce01acd8f89a6733be3d37e30b10ee39abb27d46adaf563174c4adb66c99a
font_01_sfnt_off00010bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12407 17184 bytes
SHA-256: 994f9075c062767e3c65bb7ade5e9d8de99cdaee29327b4977952c999dda35e5

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