Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f0e0fc2a4c163b…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 16:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 303806e7bfa570cb2755fbe208c21774 SHA-1: ef7c2f0328ccb49476f4f44542d59fc100dfabc1 SHA-256: b2f0e0fc2a4c163b5599512c1fdfaeae442700a748ce3c46577413150af1fedf
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute code, likely for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/82875efa619df8338ca76edb4ab4aae6/8912326490.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096ea721ee30---zinikugefiwatikad.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607565d19cf8e---porowinupedonexakorikuku.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/22885024523.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608323967f233---tudezavotuzi.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jlg8bf0a2fssk7t3454i20isr3/pupoj.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/refevotiwurodozasil.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/5be4c09dp6cfmdabsfeopc7id2/surerova.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/98151066184.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c41bf6e7d31---kinujubalefupoji.pdfIn PDF document text
    • https://egf.tw/test2/images/file/wuwijajutenugipidom.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/96168278872.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/jusemepewugirasuruzawariz.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/puzozozaluxu.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/ninonavi.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/nariduvalosexazisafi.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/cgsf2nbognq6oq2o5pvduro95r/gibenelitufaxi.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-14/20210714105257789064.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/54d8113bd118faf1a5ff6f05de4590ac/joxegesunivekedeze.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/38726139579.pdfIn PDF document text
    • https://synersys.fr/contenu/file/72121545622.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6189ca49---16841694394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=haryana+vidhan+sabha+result+2019+pdfPDF 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_off0000d3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BB 11348 bytes
SHA-256: 1af80df07ebc283db52537cfcee5cdcab43216fb031266314ba74a94a2e7139e
font_01_sfnt_off0000ee35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 20740 bytes
SHA-256: 6e32c787a16f6208971688f8ae66499375cf6122a26c3386facc3a0d5911aeab

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