Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a05c5e183aa258f…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 11:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d16fa1c1124bf2a56e15c7c8f14a5d4 SHA-1: 65806f0ea3e9a5fd14d6af860267afcfab0c022b SHA-256: 8a05c5e183aa258f60adeb494fae43cbb84791f093e177111197923f1132e776
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised websites, likely serving as a lure for users to download further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the malicious intent of distributing harmful files through deceptive links.

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.
  • 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://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f167aa6d---45276802422.pdf In PDF document text
    • http://assushop.com/userfiles/assushop.com/file/70403390993.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/femikerenolib.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e5a480bfc8d571ead073216c19fce47b/ratixewatipudimoni.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/jf46oevmbrdm69qt6img6nd3ia/tumosebaxowowodo.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/1529e3cec1a6b3e5b275e83af16b01df/fimopawenosesegoxiwivuk.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc57c35142---rigovisagesa.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e22a4d5c336ff55ac2f54f26985c1a87/jozud.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xivowusixosetidebifi.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/f385351d7daf0ee4559b886444c15549/jajojunobituxekaxobiv.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/4749fdf48629c785138eef74c235dc7d/53932114169.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/8fd56f2ca27738c0cf12fb4a29e45d6c/21829483671.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/v8983o6kptv2fsvn46tpqtrd0b/kimolu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aed2a08e0---sijafaridaxemizit.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/77240268610.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/fonelarijila.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/5365507723.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/63801577305.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdb3d9e2a9---gejeninimuf.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/27df93cc9566be13f883b5c7d4fd7dde/87263537732.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f5lsp7t4pdqljdjd5rrabi2qa/nefasuramobosodi.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115f007f16d5---tuvarofubofudawubagote.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/gevenarox.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/66234283223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pdf+chacha+chaudhary+comics+free+downloadPDF 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_off0000c351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC351 19340 bytes
SHA-256: deef38e7740bbed4ae18c82cad23473769283298685474824a3c36bc23221857
font_01_sfnt_off0000f60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 10944 bytes
SHA-256: 238ded6138aba22ac70308814337cdb51bf23a13f51806d198b22582dc0241db
font_02_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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