Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f1bec0856fb720…

MALICIOUS

PDF

73.7 KB Created: 2021-07-08 09:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e42415d57a3ac3a33f995708b6b4694a SHA-1: 7b89db7372537055b21b88162dd79427af1f2774 SHA-256: a3f1bec0856fb72048628981451f3aab6eeb973afef582fd5aaae233fd615329
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=lil+pete+ridiculous+6
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c898d55dae85d74e3ac87c14379b136d/pisigisujibotuzuk.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea302d97d3---tamuvonipeletoxaduzub.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078a8b51af87---74158339159.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ce2e704381b2d9e9040625aeb5bbd970/raxovutidefide.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/waxozakubepuf.pdf
    • http://jarosi.hu/files/file/39862777171.pdf
    • http://giprozdraw.ru/ckfinder/userfiles/files/27685071835.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/gudipizulaninasodusuxud.pdf
    • http://www.samlab.com.tr/wp-content/plugins/super-forms/uploads/php/files/289382qeb2h0pj1l6qclovmqbs/68424417406.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed90ong9qnnefac9u4k3u6cdso/25437990616.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609595ca04b76---nukurunopetaxotiri.pdf
    • http://cungcapluonech.com/upload/files/73973153574.pdf
    • https://cape-electronics.com/media/file/92462642916.pdf
    • https://aterhesseg.com/up_image/file/zovafewiduwo.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/69319266702.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/f8dac42ee79404c4361c9125a7b78661/71176678070.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/75093490ec391bffd6ebe4bedf011d76/95768515455.pdf
    • http://luchetti.it/userfiles/files/zofuzusapedopodapivaja.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f1edf0a5---54320035117.pdf
    • http://smclassof57.org/clients/34860/File/kogutabatumotafilewefulu.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/fevix.pdf
    • https://comiconfezioni.it/file/toleduf.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed69603c5---bovutodutuzasibenazam.pdf
    • http://botosani.ro/img/uploads/file/23433950514.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_off0000bd73.bin
ffe1ebcb8a21cf1454c1178fb377b3db92d3275c083c314ba47f86506810a705
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD73 16472 bytes
font_01_sfnt_off0000e849.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE849 16792 bytes
font_02_sfnt_off00010060.bin
9526c28f1bafc1b7487508f6b742db47e62de95fcea5f17e660d47a0ecd11b6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 10464 bytes