Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d803bffdc15204…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 18:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad8a640c99a10680aff77bb4195a1bd5 SHA-1: 41fa90fb55a91119e16513d2f1a8f218d27b5e4d SHA-256: c2d803bffdc152042f1a8094459146d0b8c292f4d9ce97f79a4f91a4c8abdc47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 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://tunglamgarden.com/images/fck/file/38628107591.pdf In PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/joxenewosinakava.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/sajelatazoxilibib.pdfIn PDF document text
    • http://uteambio.com/upload/files/78841337411.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/db1lganp2drdi3c6eqp0h6n7pj/37156162411.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608655c7cf7a2---87077118110.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/93653400932.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160723150b7de9---xefisewi.pdfIn PDF document text
    • https://kaisar168.com/contents/files/gavilexud.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ju45j4428ht7hn235qm2rbu2n/pisupememuwapesarejujipo.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9df0c4facc557836c21204370db921ca/bodemibujefipoguduladat.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610a25725480c---xorabunixafozujoxu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ba474a9f8---gavovezilivokokegogeb.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/tutivusede.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c439380d879---luxivizexe.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/zexuxefijixosifuwanisoda.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/28907908432.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e5b6276e9687859b91b36d26d469dccc/negowilogewasofixupaza.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/161542324.pdfIn PDF document text
    • http://nenorm.com/files/files/periwabidizukurufod.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609176e3d81d4---gorez.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/dajipejisu.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/re11ueuibtudvn87nj1cfecnoq/tinajurukug.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/6294ce3e781c68cf2afb92be81ad5b3b/lagisujuledovebinepegovo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd764cad3d---pulefawalemufifesi.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/33974371583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=exfoliative+cheilitis+adalah+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 10664 bytes
SHA-256: e8ed038040bb33ec4a7cd5d6267076166c1cebd1ac53b66f70281043fe9191aa
font_01_sfnt_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2B 17084 bytes
SHA-256: 7e9b8424a5ff218c9e7e6dda31f9af3953c7751fc23c2676cf3817da749a5b5e