Malicious PDF — malware analysis report

Static analysis result for SHA-256 b910d55ca24a13d5…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 01:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b5727692383ee6da16eb3622a21e7f7 SHA-1: 2d2ce9287993caaab949c6d048279f1e1cdc5d12 SHA-256: b910d55ca24a13d5a4571399601161d5729448cce684171a6936a0e285828d86
156 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm, directing users to multiple external websites. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://k9careclinic.in/ckeditor/ckfinder/userfiles/files/17330676019.pdf In PDF document text
    • https://clubesolbra.com/uploads/files/56765229010.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/zajagexenukerupufudud.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/65625690369.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/vemugutunesajekimexotene.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344cfd5da1b---xavaf.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c227304c60---90075567583.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/66012047375.pdfIn PDF document text
    • http://jonellchem.com/upload/files/99061034822.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/jorelozisekul.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/zefigurumafe.pdfIn PDF document text
    • http://pinxedien.net/upload/files/fabilijuguve.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/lenejixim.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/mefovaj.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/68224476979.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/40871408703.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5e03f39a07f69e5c6940b9c026ffb3d9/70956647105.pdfIn PDF document text
    • http://greenld.com/userfiles/88530039142.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/poleba.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6fd6663e97a5076cea9597b3f6747206/9551792886.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ifasomipomasadajoneva.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/45732650245.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/xinipebex.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/lifetapupemam.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2451028805aaddf27f97e98dcdc6ff1f/24837976197.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/donatan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=working+fake+credit+card+generatorPDF 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_off0000b3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BC 10520 bytes
SHA-256: bf9438738c55cf48ce540aca51b611ebd23fb0bb2963d9df6ffeb068bf75c2f5
font_01_sfnt_off0000cba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 14196 bytes
SHA-256: fae63cc760d4d344249983f0c90bb87e802fdadaa8610235d1e20c0aeb9a00ba
font_02_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1