Malicious PDF — malware analysis report

Static analysis result for SHA-256 68280391a780bb5e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 12:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e515564fcc7f3b3ae7cf5e12ff49b70 SHA-1: 2baa68dd8c8b7ec441876f2e44fe8f078eb9c3cf SHA-256: 68280391a780bb5e110ca8c2c68c8763a87c7293ab1db21dbec4c50cb6b704de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress sites and disposable hosting. The embedded JavaScript likely facilitates the redirection to external URLs, which are numerous and varied, suggesting an attempt to distribute phishing content or further malware. The presence of external URIs and link farm characteristics strongly indicates a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=elvis+and+me+pdf PDF link annotation
    • http://babyshelter.net/assets/upload/files/37225774133.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/kubixolibajedekeriwitobog.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26172598002.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/19489960213.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/28979120322.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/toxatiliwaralozibedetunos.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613af84acc936---19067242750.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/zuxebugidamo.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/98410511123.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/58342456842.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/89740161559.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/sosisuvelu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8f7c3160c---govarovovoxifav.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebe6fc7b7d---voregirigisagev.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3d2d0891---kipiv.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/59442483487.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/muxikasirot.pdfIn PDF document text
    • https://menu2uplus.com/images/file/xezobadodiroje.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613996d480b7e---62206404585.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/damifisokodatudokusuku.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/gegosuwazuwupusab.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/xanawirazufikitovez.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_off0000d664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD664 18520 bytes
SHA-256: 32de73a77b2cfddca746ecd99ab9fb43cad302b644635b33037911fffc5d7e82
font_01_sfnt_off00010628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3F 10392 bytes
SHA-256: 2000a084f1d17e0ab597a6639800e4d3faaaf9a4528e630d365c78f6e2fcb801

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