Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5cc65e8a2f01098…

MALICIOUS

PDF

76.4 KB Created: 2021-07-05 19:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a06866f84fb422664d8edcec491d1f96 SHA-1: 5654176605b01fa5d4a21d45e39b6354611cfb53 SHA-256: c5cc65e8a2f010989e111e16efc63f69d22f3c6e7e722d7408b7181ebfb0d6f1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=swing+swing+from+the+tangles+of+my+heart+lyrics
    • http://thestarbusan.net/FileData/ckfinder/files/20210610_C42EF98D6BFE33D1.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ctqk1v3thk6ddsphg46j9i5gda/93880509821.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/djgtnmpf6v5ejrdouo9jndnus8/72359649378.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b31e1ad92d2c0c2552d25a48caea111d/kapibeg.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160811ce202e27---bigogosafuxilewek.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2d7e1ac785fa4ff3b5ed032fd0759528/15045481408.pdf
    • https://hohsingfiber.com/ufiles/files/turekadesobifonegunureduv.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3f2b03db32bd798c2d424692f7e01a06/masadizuvuwuguvopal.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6f135ec3fcc6084c2e6e2bf96c62c039/zumigog.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16096503990fc6---39886058275.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160956ca991eba---neratizebini.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/f36445ae91b65506ae6aaf8eb7779630/kosujotawaselitolulagataf.pdf
    • https://topinsolventa.ro/userfiles/file/melitomijosewasazibota.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/xomabuwimemizom.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c9550696---44951661615.pdf
    • http://www.bluewhaleline.com/image/upload/File/muvepejabimotubevitiwula.pdf
    • https://campermagazine.tv/public/file/9003378265.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160961923082d0---91496682098.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7619a2f79e---77798238322.pdf
    • https://virtualpulse.eu/UserFiles/file/58416267138.pdf
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/simipoloxejotorukazuzur.pdf
    • http://davcpundri.com/css/file/bunulamupakegutudiduxol.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7af06da2c---zidoxozipuzinugov.pdf
    • https://chris-arnold.com/userfiles/file/4539129745.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071d10b023b0---kigivodixusiba.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/tafrhe2t9ibo5kq9mul19h7pu4/54537214162.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AA 16792 bytes
font_01_sfnt_off0000e1bc.bin
1848014d4fbb4bb8c63cc2f507197a6a2006bee9f40cef170b16557b9175c18d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 15800 bytes
font_02_sfnt_off00010a59.bin
0ae78b8dceaaa875c1db3d9c75b8a331c6de58a8e9ca46a99642b1c40216541f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 11056 bytes