Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbe211240a13ad3…

MALICIOUS

PDF

68.6 KB Created: 2021-09-19 05:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19c3416f6ffc8954de523ea838b2955c SHA-1: adc10f2e5ca2880e1101ea3046a0aa562ae9a33e SHA-256: bfbe211240a13ad3b025ffd82cf79559f849635c59f34cbe5317151ea1e0c202
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, several of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://rollfactorytogo.com/uploads/files/61782896441.pdf
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/77681465038.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140e32f85883---fawotuzuwumupi.pdf
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/58681583538.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613993867e64f---43709975329.pdf
    • http://flightshop.jp/images/blog/file/ruviluzej.pdf
    • http://www.puhito.hu/uploads/fovubuwiw.pdf
    • http://chandravanshi.com/userfiles/file/gajukuzazop.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/39382399198.pdf
    • http://cokhihoangvinh.com/uploads/userfiles/file/wedetagigonizafener.pdf
    • http://abwferrellpkwy.com/uploads/files/kevoxagage.pdf
    • https://keiba-like.biz/js/ckfinder/userfiles/files/neremunapadazufajiden.pdf
    • https://textmakareknutsson.se/upload/image/savovowegatu.pdf
    • https://siltri.com/fck_upload/file/masinadalur.pdf
    • http://n2nnetworks.com/files/others/rokud.pdf
    • http://www.tobywells.org/media/fckdir/file/42569055555.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614181d086f25---juwaxijigabenunepijujek.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353b6bc4abc---12009535935.pdf
    • http://vindindex.nl/images/uploads/62674882765.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3a8701f63---20086192948.pdf
    • http://vin-baietii.ro/ckfinder/userfiles/files/36168282262.pdf
    • http://dh-cell.com/ckfinder/userfiles/files/72732614859.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=airplay+android+4pda
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae20.bin
2de1a3b04e40f3fc55e36056ba81928d17f2f38dc275b53ae80763faa2bb2d25
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE20 10160 bytes
font_01_sfnt_off0000c4e2.bin
2fc55918f97f4e0681ccb425e685c7502584f0445807b2e78fd9a79f847abcc7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E2 15712 bytes
font_02_sfnt_off0000ebc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 16792 bytes