Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8b1cc47b8aff2a…

MALICIOUS

PDF

86.0 KB Created: 2021-09-20 06:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec1258b3d88ea8070108255971308fb9 SHA-1: 15ed24620a26ab2a56c12ce6bf0897061c482628 SHA-256: bb8b1cc47b8aff2a5c68f68c1da60b2ecaa8eedf5a92f9977c250c8d8f9c86a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

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://thinkglobalcompliance.com/ckfinder/userfiles/files/kamuzemagiwefet.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/72a92b5c5ee2ce9eb7f0d85cf6d31774/vukexofutipiporafipava.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/41016798309.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/51562859595.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/98329512648.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/xinosesaxexutami.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/55399395476.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16145c02800dd1---bezatapederumorobamurog.pdfIn PDF document text
    • https://partnermind.cz/images/files/danejofuvilojugetiwani.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/43117118566.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/11869217262.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/60469460977.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///53468868216.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/gawujeko.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/d76issdh58fbbl75b39bckq00m/59771853354.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614398b44ddae---pojelo.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/83372651162.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/zevusukavi.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210913223427.pdfIn PDF document text
    • https://yellowstonewildlife.com/mafigazemuzuvokurofojaret.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109032223431602.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/80732021062.pdfIn PDF document text
    • http://test-immo.com/file/jamamalaxov.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/lexepexukiwilibi.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/jidafifa.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/11893783560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=night+vision+2011+watch+onlinePDF 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_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 18864 bytes
SHA-256: 3e49c28acd8db3e8260303db71eece67eb07c961eb41f12beb7c2e18736ae44b
font_01_sfnt_off000118c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C0 10832 bytes
SHA-256: 108776ec0f3ee27691963a5d52283ecd9717b528569c068ff6e6fa19abc7a09a
font_02_sfnt_off000131e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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