Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d3f64c3a9983e7…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 15:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c7e3760688643d4e647098c5b15cc99a SHA-1: 0d87169e080f3e4f64bc349b877f4b441f7d16a4 SHA-256: a9d3f64c3a9983e70d34676e5c4e3a1381650eb13e3d78537bb8494d5f6add66
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting, suggesting a phishing or credential harvesting attempt. The embedded JavaScript likely serves to further the malicious objectives by executing code or redirecting the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://fotojursa.cz/userfiles/file/30245109776.pdf In PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/99834436572.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/loxujadox.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/gewupagutivovofob.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/gesukuxuwapakepot.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6aaa3e9b7---femupefinemewot.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161416370c6485---18491317354.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///19030661526.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/16126549595.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/99417860593.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/29706161674.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/zujijixaxutifule.pdfIn PDF document text
    • http://rotterdampools.com/contents/files/nopotediki.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/zegejavajasizumivas.pdfIn PDF document text
    • https://ntc-container.com/upload/files/rupelalinavi.pdfIn PDF document text
    • https://norservis.info/files/files/62310194643.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/vunujutuj.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/70299027592.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/3144959418.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/zanobabukosuxazob.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/suwimivifusutadewezeg.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/pepofosubewu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5ej8pj2ttr9dqedqgk8p8on71a/judazagifuwazujuxasu.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/zegavobubijagezemuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+open+usb+debugging+on+android+using+pcPDF 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_off0000aeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEE 14672 bytes
SHA-256: eabb69e89548b773bb09ff348c7c0f46a5345822c10e7f6fad28bc4ad0a6fc2f
font_01_sfnt_off0000d387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 10960 bytes
SHA-256: 8ce20b8c6f9a5e740a36c449ebdadb4b72b66990c4c9952fc43852ebc13894bc

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