Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb09b9a50b60de6…

MALICIOUS

PDF

84.5 KB Created: 2021-09-12 22:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a0e51728b7f16d0de520d4965bfa764c SHA-1: aae94ccd4c407de7ba44ea3786b0298ee932fc66 SHA-256: aeb09b9a50b60de693087d9d27384519328d86ab508ab81496ac693486261d73
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites and a visual download button, indicating a likely attempt to trick the user into downloading a secondary payload. The presence of multiple links to potentially compromised CMS upload storage further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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.
  • 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 http://traktor-tv.de/sites/default/files/file/riwoxotafevabawatumelijaf.pdf In PDF document text
    • https://mosallaesf.ir/uploads/ck/files/3278458708.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109110753137603.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f583491d71---roxetipapuzuni.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161382abc2d485---30923268995.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/6494747100.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353e66784c7---15244195216.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/penegubaranamik.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/wanuxapinip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b58e2dd2e1---85525012850.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/87103123640.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/6985790727.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/zadowebo.pdfIn PDF document text
    • http://mp-journal.com/media/file/1607159113.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1c147c8df7016b8a18d0879ba31cf13/63850688865.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/49157503909.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e9cef7d6---49463905583.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/bunalafefutapid.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/96105215410.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/4185675990.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/68819904665.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16135280f240cc---tajumejezodavobe.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210902000307.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/90268063262.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/55286395232.pdfIn PDF document text
    • https://mollis.rs/files/tugodub.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///72595257648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=stream+download+apkPDF 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_off0000e420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE420 18884 bytes
SHA-256: 47d5a3dfe78d0e3fe4bac40b229a61279c99f9c24b931aa3ac2a50ed85041f8a
font_01_sfnt_off000114ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AB 10544 bytes
SHA-256: 16fdecc07dbb16b06f827fe5014157e6a765e47b9eef5376410cda6ec226ea8a
font_02_sfnt_off00012cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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