Malicious PDF — malware analysis report

Static analysis result for SHA-256 00fcac4684ae0cf7…

MALICIOUS

PDF

73.3 KB Created: 2021-09-13 21:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3a01f7c58bdfe08b0edf4b3fda585938 SHA-1: d4146d46298e73c984717e5e5d5529238589ca0e SHA-256: 00fcac4684ae0cf7327d8a09626dfe795492ca1436b95b7dc5f270f166576d4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and ML classifiers, indicating it is likely a phishing or exploit delivery mechanism. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of external URIs and a link farm on disposable hosting further supports its role as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://aptekadc.pl/userfiles/userfile/14112409405.pdf In PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/3831468925.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc75bc2060---gukojaf.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090122275473499.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/80714517966.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/56761264434.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161377b623c891---pamojagebegoligawedebos.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/pebuxovilasizataxiluke.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eeff169cc---94849324066.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/toravebifafojiwurewinanaz.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/59593915730.pdfIn PDF document text
    • http://agrion.org/upload/fichier/xiridajugezujitele.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/28883880078.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed473d62aa---97392028998.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/64525139751.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/11123039563.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/75271746370.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/84511464275.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/fodubigazaxegel.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/meguziba.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/dapijulewerak.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/57989084069.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/mojopijidawibekifo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa34353c2---dodegubobe.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d8caabd7---39565028969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=change+notification+panel+androidPDF 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_off0000beee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 10760 bytes
SHA-256: 76feecbfd4c26afeaa24bf8ef1fbcc7fbd35f4db479467af99237fbd4f9c2fa1
font_02_sfnt_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 15544 bytes
SHA-256: b3f07801effdccd701cad99e19b91cb0930833cc6b51b08eeb986c53d7033889

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