Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d367c5cbbd5549d…

MALICIOUS

PDF

78.8 KB Created: 2021-10-13 08:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7ea0dfcfcce21acae73ddfbaf5288b17 SHA-1: 4e3042e79760e941d900f297a91ffce9fff952fc SHA-256: 9d367c5cbbd5549db0111985a495ac4ca6228aa7564a99e9dc1631cbf5d0d781
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of multiple external URIs and link farm heuristics confirms the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=organic+grocery+store+near+me PDF link annotation
    • http://chronocertif.com/userfiles/file/61181192108.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/wajudagoveku.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614460d8b3efc---jerumagabanew.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b39d550b01---tinideresoxoketewem.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/mefoniberi.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/basejugebexagepasowepegul.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/1685126883.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/50132615904.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/71532836104.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f17c4091a88d7db6ad947faee9a11b54/bawupelunelerira.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/54512650119.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/kujewaxofonaru.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1tf1o6u8srmcfpaavr0sh6oit2/soxokomuwapolumukibakalil.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/dezuvu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2b3b6d61---vezegajobilozufosofi.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/7964855129.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/fipavapolagigebolow.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164236ea35e0---nasesagamabafatagilod.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/45898487992.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca961942fb---55335627020.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613557a00d995---38137407464.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/nawifejal.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_off0000d2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FE 10664 bytes
SHA-256: 4c0990b9e6b78053a557c9ac9ffb797c14517c18024641e7466f2b1393c21025
font_01_sfnt_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 16732 bytes
SHA-256: 0df3ac8b95160267b3e85639fe1f800b94145fcde13d8b06a78ad9e3d9a1e285
font_02_sfnt_off0001161e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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