Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6d4c1c81c942f3…

MALICIOUS

PDF

83.5 KB Created: 2021-08-16 12:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44ca3a536f0ec13d87619f1e3f1b687f SHA-1: 6b2e101222b2e20ad102c5d066bd16fee30079a7 SHA-256: 4d6d4c1c81c942f303b194da6328ea4a5a35bcb3c3218b0cf1a1acf29fb3205f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://domusanna.it/userfiles/files/ludazit.pdf In PDF document text
    • http://gloria-eurex.com/20164790143.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/nedimejivuga.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/47447662801.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/bijulufebesebogezejuvig.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/57559866961.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/73296667881.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090760e89555---dazuxezogudojaruz.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/036a13eff1208dfacbdc73672f3ea132/pivafi.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/36022325888.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d663467e---bulag.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/petudunimipebeti.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d75bef0993855f16c7377b2d4911a65a/telajuvejobozimemeruxox.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e6ca7281e---99579440327.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/zawovunesovaze.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef2777789f---15852733144.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/3897905279.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/94580240643.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5444e23fb---zimofapep.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/f6d6mmqjchqd6ka0kattliroq5/wodupifukapagafufaxi.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210530_010746.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a46dcb5bf---9050870841.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104835eae691---87678764850.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/pb4mgnc5jqkvrpvnkb9boqrppg/4001645483.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/vefefuzet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=a%C3%B6f+kamu+y%C3%B6netimi+ders+%C3%B6zetleri+pdfPDF link annotation
    • 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_off0000dc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 11100 bytes
SHA-256: 0eb2c0bcff13ced6bc8fd071bd3da63068b3abf93f59824e8db72a4135b8e42b
font_01_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 19068 bytes
SHA-256: e6ca6f56c3eba0291bd8285f0962ce5f812045523c3cdb1917d1e132f234cf50