Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b4ef056a399bf7…

MALICIOUS

PDF

71.8 KB Created: 2021-09-02 08:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9571976a746fdbb8944e765d6fe31e6b SHA-1: 9db8b5826d2db4fb2146c0e37ea91fc8cb90d55a SHA-256: 19b4ef056a399bf7ad7c733589abd2b9472eb06c13dc9e5607fa36dd7ff3563b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=cure+coffee+shop PDF link annotation
    • http://innovatepc.com/userfiles/file/64254017324.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/d787fdb6eb6bf7c2394acf6a61407d0c/59843226986.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d91e79dc5b---goligesidovadomati.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fa8be1110a9---50374006332.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9dc5b6498---bupobuzoxivokenefinal.pdfIn PDF document text
    • http://suaups.net/userfiles/file/lowepowol.pdfIn PDF document text
    • http://rnralpha.cz/res/file/vevibu.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/92273610449.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/21256170306097b4b4f2c1f.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/93222162753.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/66259989131.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/jujatilapofokudodidekemok.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/dusitekajud.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b60851cc7cd---tonexusekitavoxotuwado.pdfIn PDF document text
    • http://aceranalitik.com/ckfinder/userfiles/files/pijigijirelititote.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607443366db44---mewilipezujezanepuxe.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/gumilumukodinudesux.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16087b66fe673e---73218718152.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/95354604321.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97876225424.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/biwivara.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/76u5bt1hpgsu3brlct2gb7cbql/86453344806.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/vumulubatijomamam.pdfIn PDF document text
    • 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_off0000b7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B8 10208 bytes
SHA-256: 045de013b20e0748fd8227f917a2dcc85e67ababb4e8fff1bb8812b8e3758df1
font_01_sfnt_off0000cecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DE 16932 bytes
SHA-256: c64d0f9abbd141c0731e6da3a61b599c87b358c6a38f358ec407fb3512f33a7a

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