Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd15a646c0e99ea…

MALICIOUS

PDF

108.7 KB Created: 2021-08-09 02:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1d6bffe3efe796ac0fedb89db2a6cb2 SHA-1: d94780bbb8f9cead22b1b7bb84d52ff1a8a1eeff SHA-256: 7dd15a646c0e99ea03c89225eb3da37e2e0e6f29dd047764adf1b8aeb0ad470b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0f2c73a0d---noxorejimozujeduvax.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/slt19o980b4k7lkujc4hss43t0/73813977972.pdf
    • http://massvt.sk/editor_uploads/system/files/fegiruwebanevomamef.pdf
    • http://canxetaianhduc.com/images/file/temubejo.pdf
    • http://jiuxingchaoshi.com/uploads/file/18162014651.pdf
    • http://hrudolf.com/userfiles/17448816066.pdf
    • http://studioriggio.it/userfiles/files/nuvipumaxaj.pdf
    • http://agrion.org/upload/fichier/24792982329.pdf
    • http://pogservice.ru/userfiles/file/wuvusuwapezowuxowid.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aba15fab456---rolisajupafelitoriv.pdf
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/96808655317.pdf
    • https://aawyx.com/sites/default/imageuser/file/wejepowokejodojokuwudodu.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f75bef331---sexir.pdf
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/fipekimo.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e26a88be5a0---87729320364.pdf
    • http://cl-pub.com/files/files/mowuvaxesatefatidumof.pdf
    • http://alt-1c.ru/userfiles/file/gedepegemes.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098235e42630---bofinap.pdf
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/rukepezawikemipe.pdf
    • https://cherrychile.cl/cherry/uploads/contenido/files/13156127947.pdf
    • http://bindashnews.com/userfiles/file/notokuketadiviwidutomeg.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51f16701f---rulewotowerikagik.pdf
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/musagomiditikamag.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+are+the+main+elements+of+contract
    • 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_off0001454c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1454C 16792 bytes
font_01_sfnt_off00015d5e.bin
6951747502b2109b38972f5b010ff44074c1bafb9e3f3681f0e83fc34b67eb48
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D5E 17784 bytes
font_02_sfnt_off00018c2b.bin
9b122ed3510f3a9c3475666808c105be59b55199c94345766ad9b9a104c7ff56
pdf-font-stream PDF embedded font (sfnt) at offset 0x18C2B 10596 bytes