Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb476eab1046e462…

MALICIOUS

PDF

119.2 KB Created: 2021-08-13 21:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c61ad62b8c6414586cded890e0d1c6f1 SHA-1: 4885b303b928cc3fe77db53f0a518c16e0fbb326 SHA-256: fb476eab1046e4622e04840c224ac085508cc85b549f9e4a8a7cea1241da2027
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/67c1c1456b579e3510ea6a6999a2a68c/rufuzek.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160736a5d07258---zenowezipovubibaxu.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/31432402962.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16110de0b2ced5---giwifevobububob.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f1c9117b87560eb8d98ad6076a2d8eb6/62454261616.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe03759d0---20916419949.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/794533b350d4d0473c1b874b014d5275/kefapusovapi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610cf8088e66a---xesojezuwobupidemolime.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/venatulowul.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210724112632_fo4t4r.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4rtsmd8ce88aljndbv301ck6b6/tufoxexex.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/62502823191.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/15174319960.pdfIn PDF document text
    • http://hanshintech.net/data/file/xuxosajogenofesowedika.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606e99efacad0---33807385228.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/23245294755.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/19046135005.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/0e7ec9ce76d4cfee837dec99101b9c59/72235284431.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/pibosopomudopavegu.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/nizibagiwefezuzavut.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a096074c1---tabofububu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca19bc78a7---vesunuxol.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/bopuvetexelatowurulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=probability+random+variables+and+random+processes+solution+manual+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000149bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BC 18380 bytes
SHA-256: a37cb8551b77d2b607dd78091bb752c18266b7c7d8b80c184f1c15329b076b4d
font_01_sfnt_off00017a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001927d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1927D 16244 bytes
SHA-256: b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
font_03_sfnt_off0001a830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A830 2236 bytes
SHA-256: 68d5b61cb233d45ba2af6190cf611f9963f79b520857808811b8c2f1d6b36cab
font_04_sfnt_off0001b2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2E7 11200 bytes
SHA-256: 2fca1775cc15f516ba4cf6cd9d32d7d21b7c35143906fb28ff203166981d4547

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