Malicious PDF — malware analysis report

Static analysis result for SHA-256 4797da5d0c0528d7…

MALICIOUS

PDF

85.5 KB Created: 2021-06-27 05:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 401eb4bfa8bb110b7c1efdcb1bd605fe SHA-1: 29d9dc7e8016ab34f6bfe331b3a2cde03198bc03 SHA-256: 4797da5d0c0528d7fdbb2cfad7c82807482c8c78fc833bafb7afc1398532c5d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://catamma.ru/uplcv?utm_term=foot+fungus+blisters
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b947b3285f---72400304162.pdf
    • http://elsekmont.eu/userfiles/file/xefivudenamazek.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/cbbdd80da0ac8c663801ef3876ad36cb/buxolexufarudap.pdf
    • https://dgssu.com/upfolder/e/files/20210620184809.pdf
    • https://aviatroglo.fr/IMG/file/61296772315.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/29415b35eaa2e3a8e11507d5759493a2/kezexinemozisevudibupexi.pdf
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/e3265954ac58622b53b44e99081ca796/zorosorovov.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840924daf3e---forowukijavetopavutezuvig.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/g53gd9pv551scvo8dsbs97cpdd/19848627215.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f7cacffe77e479a2ffb085ae7beeee7d/gugedozajuman.pdf
    • https://catbasailing.com/upload/fck/file/68680584715.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/9b65458cab22576288786bf576e7f71e/52254102784.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/jm3ifn1bp36v4lagdcl28pas7i/rovusifukimoresor.pdf
    • http://jar-ted.pl/file/rorinopoxikudesoxazavokud.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/qc0v9du8tsff5s20ohrrcq2uhc/86532745515.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab20260678---basusepezeresepubugugap.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ba603e5ec10---jefemu.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/df9a854d87bb189ca9dadddc409fe4a2/40446521380.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/ajqgkql6tjg3vqroclo6kfnd5i/koxurow.pdf
    • https://parklanehotel.asia/userfiles/file/funixozapuwi.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab677e001b0---jexexerodixebukanasanuno.pdf
    • http://vaikevai.com/ckfinder/userfiles/files/kirew.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pubide.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c12ea50c4---wenukoseza.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf5faaf865---vuriwoxu.pdf
    • https://musikkursus.dk/userfiles/file/19641151103.pdf
    • 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_off0000ee84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 16792 bytes
font_01_sfnt_off00010696.bin
9092b5769b5dd826c0a39da408981d5b185103a58c0bacae4a1947e0c8809689		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 16432 bytes
font_02_sfnt_off000130e6.bin
227e43f88604e38cf420b65de7a676091f444f9ee8a99cd86d5b0b27a410cca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130E6 10444 bytes

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