Malicious PDF — malware analysis report

Static analysis result for SHA-256 523a4a67e9d14087…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 18:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06d9dc87007ec86723874c8f10ed2777 SHA-1: ac03e753491e3ea9cd8963ae0eacda80fa219993 SHA-256: 523a4a67e9d140874462dfb08bb47aec07583b1cd688c8ceb79cf1e41c4ea88a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=wandavision+free+stream PDF link annotation
    • http://fratellibeninca.com/images/file/tujurij.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3681a16a---42586226939.pdfIn PDF document text
    • http://htwy.com/upload/file/44548567755.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/rapazegukewijaturo.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/kupinusazelimuvu.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/30329532236.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/tesanorosugaxubo.pdfIn PDF document text
    • http://short-story.ru/upload/file/85763025439.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/76450176581.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a3df3288f---117755323.pdfIn PDF document text
    • http://rts-3.ru/upload/files/tiwutop.pdfIn PDF document text
    • https://flyags.com/editorResources/file///48992495906.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/sifugiwukumavufalif.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/kezobami.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614294f5073ec---11145920120.pdfIn PDF document text
    • https://dm288.rs/slicice/file/38375805482.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/56343298305.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/32197165108.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/vojomikafovobus.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/xejesukekefineketazolemil.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/58164031811.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/49452955415.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/30895907241.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_off0000dcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 17860 bytes
SHA-256: 44eb6f6e0bf39d4ae1e9988e1695fa3301b5e00b9474dcf300906448244789db
font_02_sfnt_off0001237e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 10528 bytes
SHA-256: a60bf6d29fdeebad813208f5f9cfe3eccea4df3054f45c994f90aa829a63eb05

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