Malicious PDF — malware analysis report

Static analysis result for SHA-256 88916f32205465cf…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 02:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 42aad0693dd7b24fa0bdd24ff12bde94 SHA-1: 2f9b186b4a7c93e21da1289d3e023e52a64a9609 SHA-256: 88916f32205465cfacad56a478fe12ed1ff3a31ae9e9c62216c2fd00792f406a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608382779dee8---49782537841.pdf In PDF document text
    • http://zoldjogsi.hu/uploads/files/67341454545.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7c1bdeca3775477ca5c75a4c9a63a167/lupuzowomurudo.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5t35j3kb24l2tpgi9bsqhu097q/vobugumerajupule.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/27935064367.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2af26d65ec---zozunafojawakexuvig.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/dae00ae1fc30c14edbf4370c64b33bf5/komobabolenemonogisisufo.pdfIn PDF document text
    • http://atomleasing.ru/media/File/banoxisorabamuwe.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2cff2e135442b03ba4b54d26bbc7845d/xureforagebefa.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/mavulesawasudoz.pdfIn PDF document text
    • http://midel.me/userfiles/file/kurus.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/87766758038.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/wufet.pdfIn PDF document text
    • http://charivne.info/images/file/70089719114.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/futeserikezupegenod.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/wofalufuxafoxofokirakeju.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/56650311758.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb08cf2285---39318993529.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ovtp0ui6uq5tvo0tsp172da8j2/gibijojuzidila.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/vufakomen.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/27957216711.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/funubimujisive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=spelling+words+for+grade+11+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD4 10788 bytes
SHA-256: eea7de31c8eb8a51579d98ceae901ced6965f58bb40d61e8a0324aaa7a25b699
font_01_sfnt_off0000d3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A3 16848 bytes
SHA-256: 5a4d9b699c2cf973a36a355e9f069fe01dd206ee1c93b00aa6b60a7f030a676f
font_02_sfnt_off0000fec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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