Malicious PDF — malware analysis report

Static analysis result for SHA-256 35dfdcb980b20ae6…

MALICIOUS

PDF

113.2 KB Created: 2021-09-07 01:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 58a1958269fbd80adc149ab38a07d0c7 SHA-1: 2aa8b7880717a70f79e829fc92066254b531c0e4 SHA-256: 35dfdcb980b20ae636479f0704b7471346730c09aa7a9ff5dc40455635c13544
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to manipulate search results or direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/np46cnag89vo9jfebqo149lve3/61521086507.pdf In PDF document text
    • http://tlw.ro/UserFiles/file/50724122235.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/35421827162.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/202563a2924f400000bfe4b77d272afa/65229620768.pdfIn PDF document text
    • https://camelcarpet.org/d/files/55531527186.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b17a9138dd---22124657334.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd984f7e56b---74840662906.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/t1tvr0pu5alfv0nblsok0d34ll/zubirukujudulezomewes.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3981921814---93340442918.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/ranikorirasaxep.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b64bfb33fc9---surepuz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc85d7ea165---nopaxiz.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/24753359715.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1f4643689---kiwawo.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d9e1c85db---93081747299.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3ab37e591117fd114f111e81bdd76bd2/72770240719.pdfIn PDF document text
    • http://ore-processing.ru/d/files/gesafizalit.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/tuxubi.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/16133601909.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/rozazexer.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/fufisisijidopadad.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021082512484772.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca572172d1---dalixilemezalolux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=iso+6947+welding+positions+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014bbc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14BBC 18436 bytes
SHA-256: c59eb296aac0053c90ec44f1028c1440056cce062608f70a1521207c083f09d2
font_00_sfnt_off00011a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6C 10912 bytes
SHA-256: b5f7ddbcce77febaeb320edda3d5c5a49b8702404b18757b5b7889d68c76389d
font_01_sfnt_off000133ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000168fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168FD 31864 bytes
SHA-256: dd6bc27d3f6cd85cef7e8c845995a801a1dc1d3ec7d3d68ca2dec4abded6a19d

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