Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dffcdf8d5b80392…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 06:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12b91ea1dfbe8cfab4aa56734cd8ce09 SHA-1: ca7e369171e86f490d773d3c6092fea9d4903658 SHA-256: 5dffcdf8d5b803925f9637e27126b54a10dedfb7be45ab5c211ff5e160e37b41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and multiple external links, including those pointing to compromised CMS uploads and link farms, strongly suggests malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. The embedded JavaScript likely serves to execute malicious code or redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://a-swiss.com/upload/userfiles/file/terujogemafutimisigugu.pdf In PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/32431050303.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/zuvenuniv.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/sifekijijazarenegizulo.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/jezoxupa.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/62431265456.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/rosinewexewebeweni.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161302e32d289c---biwajo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161348c0272cfa---38620501627.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///29441986955.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/49557312432.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/boxex.pdfIn PDF document text
    • https://parc-hotel.info/file/13739285288.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133c46ff0f9e---37789745617.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/96320483784.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd63c44d55---nukewejeravo.pdfIn PDF document text
    • https://emprenderem.cl/files/lukifaromupigutenufope.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/87398102775.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/31039058477.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210911021617.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/ribunes.pdfIn PDF document text
    • https://shibbirs.com/media/files/gupakarokunumusatitaxi.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/xesimowopesidemeroxejad.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/rapolawotexom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=rugby+motivation+quotesPDF 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_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 17228 bytes
SHA-256: 7ae12d65181230a97bfa9a1985015ee021db94c7c29280afae0e605e03766f01
font_01_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 10916 bytes
SHA-256: c174c7983c393e4d75984e4903b206608da238a6dcb3ec55480249f5cf57b78d
font_02_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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