Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3235bdb88ffd41…

MALICIOUS

PDF

86.9 KB Created: 2021-09-02 10:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9be082fe6ece786b8678c3a0be656931 SHA-1: 4e7326563c2f863333b69e03aef67d1e8904d647 SHA-256: ad3235bdb88ffd4193708397a7f839dc853071f0996acbf2c428e8d5f2ab6368
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 acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wastran.ru/uplcv?utm_term=android+auto+user+guide PDF link annotation
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d139b72f3---38645231463.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d43b500d2---94321421418.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/3204736378.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c273e8c00---10843074840.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/zolekubepetabakag.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/rixafegowelub.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/96829617467.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/fixelatiberose.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/tubifevewoxuze.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613026ba1aec6---39288459133.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160ab45b785377---bufusego.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/v38ugnjo5l6m2073i0cpoqo8vu/31732387376.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/pabakarezog.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/14707379354.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610781bcccccb---lifejomu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0fc96a777a86685b1cc38bf170c33dfd/solola.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/53387130537.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/deb8b7332e581b1dd0eb87df5ace2d26/95636989293.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/71524841719.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/54573681475.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/kixivimuxomukanivukajuk.pdfIn PDF document text
    • http://kasargod.net/uploads/file/24928100703.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/wavixovula.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_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 17488 bytes
SHA-256: 3ed14568fb4e3a3731440c81ba6b215f4ce1fa1469f7932ae935a61d0de3e9ed
font_01_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F8 10460 bytes
SHA-256: 646f73e48a0b028bdec04b1a577362e30d66396f87ba68b741acebc6925c2b71

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