Malicious PDF — malware analysis report

Static analysis result for SHA-256 93925b0ddd0f36b5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 05:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 14ba5ae2074210ddf9874f5a6bd0af77 SHA-1: 9c3dbaddbd09ed2ea1f2d9327715aeca5cdcd781 SHA-256: 93925b0ddd0f36b5b6cce5ad52c4f552cad0f85cb6f9a9b052d94bf0dc4348dc
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users through these links, likely to a phishing page or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://dentistturkey.com/image/files/ruburigoxudasoguge.pdf In PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/bopokiguxetipinujegi.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/48712079147.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/laxagumuxaf.pdfIn PDF document text
    • http://screen.by/images/file/76732394291.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b843be8cc97---98736337532.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/0c392ab76474c0fc32a417795dc98d0e/42858057402.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210718022334.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/gonotinidobumuxiwepugilu.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaa9303abe---16054749343.pdfIn PDF document text
    • https://ladymamashop.com/uploads//files/202108100829447900.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/pitubowifigiwunojalopojex.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5bf7cdb036---baditakan.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160899af01601e---vewidaxexoli.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/wujofanizolinawa.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7c61dbd7b8dec742f7b92b0d41db4617/4698377789.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xifibisapijulolipogexep.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/gewezilikurukol.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/lomebewobugokosobilekez.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/7q07uh7eepq86f91auspdhv586/budabapej.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/87354251860.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/6900475474.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b659cb6ac---julatumobevizepogubumuxit.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/zatedowaxo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e022753e17---boratupibofiveg.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/74368360657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=chicago+manual+of+style+17th+edition+numbersPDF 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_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 11408 bytes
SHA-256: d9f18f694d4444243190f8edd24ca3b0d619c29e92d224042c4a6789178e9459
font_02_sfnt_off00010dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 17332 bytes
SHA-256: 0fdcc7f007ef7c8801a910d2b03f0e54d8f88c44d7c9c9a726a9e1c3dd4bc4da

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