Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c33c2776146e4b5…

MALICIOUS

PDF

94.0 KB Created: 2021-08-09 04:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 555307dab1b38a2ed00046c50513e17f SHA-1: 554f476fde877844e7364b82b5c78e48690056a4 SHA-256: 2c33c2776146e4b51ca7c14e5e0ab10497473bdc95c842c0cafed00130a8cfb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/dbkqakoull5nleh6u0qp1ebvgt/52544309752.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7kc8h0uiaf36846ggimf8asso3/63211044387.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a77b965f907---90400809696.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/96622992606bf535453c75ad5308534d/komevanibamisukuxemivolu.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/fc2fb9983971509baae5e8b7033710a7/gulelamekakuselibojoga.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/17196044552.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b824c1296---gifawigerexadoxalinesep.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/sepowalitivuse.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5b9f5dbdd6eda63d46db4ee0e881d7bd/35231448000.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/lipuzik.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93938d28a9---61961558207.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608816fd99cf0---12868658483.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/rp92oqm9q55too9ac90as92bf6/10006918397.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ba3d4fb044748aa351b815232b7af363/takikimamamojenoziji.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/36328793585.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b674baca690---1708298732.pdfIn PDF document text
    • http://gekon.net/userfiles/file/35539256721.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df87390dd5---bolerurudujelavivasuboz.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///6461440743.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/19595919380.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021755758242.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6qk82fv23h1ju0hjrusm4fmgp5/40721310521.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d382343ce6---dureliwubasowokolasevuxe.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607448af89260---warexit.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/5b34ef040cfab2b28f70fca74e9f431c/kowopugigadobaxufudiburo.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/zobunurezidirejakijipefus.pdfIn PDF document text
    • http://iesgrazalema.bloIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ejercicios+de+energia+cinetica+y+potencial+2+esoPDF 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_off00010585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 18592 bytes
SHA-256: 1f4015b4be48215e999b13cd95334d8da12bcfaa81c44a253b6f49d139b83811
font_01_sfnt_off0001359f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359F 11036 bytes
SHA-256: 4034b02f427d54a7130cb00156aefd2a2a4bd23b1b7be757842c0a5207e60e63
font_02_sfnt_off00014f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1