Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9afc18b246391cc…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 00:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7446a29b21893c591e1731e83c5444be SHA-1: 5afb52d983755ac9096e8d24f4810373dba55c7d SHA-256: d9afc18b246391cca09b306a6031cd3d4a454b50ecc4ab47a511e25a45840136
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://matras-devison.ru/upload/file/pubizosuvolaribonifusolo.pdf In PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/foredod.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/sisaxugobanori.pdfIn PDF document text
    • http://newshop.jp/archive/file/ralokaxawik.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/6dcec44886acdc9d916a54379ea10a72/65478665990.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/vulovakajimetolibered.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/62987854185.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/40685272552.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/varuwazof.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/mirubogorega.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/34668809224.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613577b55a5db---datojibabuxokamira.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/nanerodema.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3fd5b118e---mepewimiwegetudifonedi.pdfIn PDF document text
    • http://aquatherm-graz.at/files/69250732497.pdfIn PDF document text
    • https://costarica4d.com/contents/files/68698506488.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a2803244ea2521eac3ee77d3e46a88b0/26470003787.pdfIn PDF document text
    • https://ms1oke.com/contents/files/18230245235.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/16575292705.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/nasizoxemukow.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/bubivikezojef.pdfIn PDF document text
    • https://felicityokolo.com/file/zasanewep.pdfIn PDF document text
    • http://yuha.be/_files/file/21953581691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=photoshop+cs3+download+free+full+version+crackPDF 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_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 11236 bytes
SHA-256: a610090acc6a60720115a8ab8155affc10968e56cd1f61dbcf53920e392dca0b
font_01_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 17684 bytes
SHA-256: 3d923cab3e9f5c389c9998f4b7b97057cd9e8ee0584cd90770c4fd6519e033b4
font_02_sfnt_off00012829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1