Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a8f11f6985b813…

MALICIOUS

PDF

71.6 KB Created: 2021-09-30 12:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bd57188089ebb2326cccaf64cfeab5c2 SHA-1: a403542a169df3755837f6f04bacc6235f9564b9 SHA-256: a7a8f11f6985b813a462bde1e1fc12e963a4c9cb1b4f19e8cf9b452a05440d1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as link farms on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=among+us+god+mod+apk+download PDF link annotation
    • http://seamacros.com/upload/file/jekevikuwomolosene.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/sunuvoguxelakowilob.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/mazaluzijixulijikowovar.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/91419036886.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/retobo.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/5de627487bafe12932388fd66548a5c9/pizajukobap.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58681092636.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/68443072805.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/35048664034.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/614129097.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161459f5c52dd0---55502305048.pdfIn PDF document text
    • http://k1a.ru/images/files/file/86649498614.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/478147df6f93b92ab8aae0baf78d7e5c/78293808656.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f118fb25685e6b7837f378311729d3fb/sasoguruvopofetosivaku.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/sexedexewidu.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/17580405083.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/30553114855.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/189bvehqgv0tnt86i7kepvr121/23024744347.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/71882468897.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/74960157433.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/fesonatazidotelivi.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/39691734571.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_off0000b3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E9 17596 bytes
SHA-256: aca6b6a97e6faade0d27d306b78716c2ccaf2d995af972d51c74dc7a446f61ef
font_01_sfnt_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 10572 bytes
SHA-256: 9467ad8a12f0a723accb393f606f2dce267e2b3911fa564eb9ec8c5001fa84a4
font_02_sfnt_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1