Malicious PDF — malware analysis report

Static analysis result for SHA-256 466f2cc116d68b01…

MALICIOUS

PDF

74.7 KB Created: 2021-09-18 20:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61d6a290151e4ee0de5791b885bac8bc SHA-1: e79e9be1e5451a56ac27f9ce135461cd61f54aeb SHA-256: 466f2cc116d68b01488ca9a36095f1adb58d8dbdbe8622dc13971e04186bbcfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. These links form a link farm, suggesting an attempt to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=football+manager+2012+android+download PDF link annotation
    • https://diphong.com/uploads/38350469794.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/giwafesix.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/lafibivenanivaza.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/36048303189.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/mojake.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7022e381f---31528667585.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3ccbc2a0c3476a639b28f7147cdb7405/xotosuvewux.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/leterelobepi.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/lixopojaguzigozugugasewoz.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/41813152106.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/poxuwez.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/vadapa.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/balibuzimolozez.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/defibazunaxolagesutejafa.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/30881495525.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/futobanogulubidini.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/49075370989.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/gigubajevava.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/tawalaxonevolubotemudetu.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/73544608577.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/73599239114.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c171c803a---xetoxanunuvovobi.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210904024608.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/fudonarelo.pdfIn PDF document text
    • 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_off0000b9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 19320 bytes
SHA-256: e118f8f1df564ef006d2dc20c9ca9f75d6881016b195328812dc2e564a5be02d
font_02_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 10920 bytes
SHA-256: d53cd7745f4220bcaa03395351ea53cd0ae9a0a14fa359e084df17b42ded1b2d

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