Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40139a1d1f150c7…

MALICIOUS

PDF

74.7 KB Created: 2021-08-28 03:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3eeeeac874bf7efb3e2836b000765a68 SHA-1: 84ae6112025ea2ebdb66f88c4f2ecca580a89d99 SHA-256: f40139a1d1f150c7f6d12273d9342845cc09eeec5dfa3b0959a9b34bba598033
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to serve as a lure for further compromise or phishing. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://exihomes.com/userfiles/files/vijutelejuxu.pdf In PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c09b50fea9---76847299002.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/74367859721.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d0e3bad9ce96d93c9dc20695c7d4be34/77294963458.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609652f213679---lesube.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/gigipowedojukisubutuxoli.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d83dd856d53---65116058152.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/vulisoj.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/37912134469.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/89378505630.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/89822706971.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073af4a32e5f---vezad.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/423129746.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/69063676785.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/vajebamomi.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160be5e0dc666d---22322937580.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/kuzifasubomak.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/wexinuno.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/suxanoloxonam.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/konolesaf.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/93155962165.pdfIn PDF document text
    • https://bataretak.com/img/files/file/xawegeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=daily+useless+factsPDF 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_off0000bfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD5 18084 bytes
SHA-256: 8b976cfb2d60db3e84adb1bc2c220628e7952a1e81c7cd972efbfd5db5d2c09d
font_01_sfnt_off0000edac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 10220 bytes
SHA-256: 701a2357338ddaed1830e3ac3f80e91fa73e5c92b94355714ee07e3b3263157e
font_02_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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