Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd097117982f871…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 14:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f9798bf9883c27f9666addd6623cb926 SHA-1: 525c689b7368f03c6e96c34c322cbb534f2cb980 SHA-256: 9dd097117982f87170813a07b09ea390648d17150c7f7fb9cac70f5d5a41d8ff
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised infrastructure suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://oniceh.ru/uplcv?utm_term=pokemon+fire+red+rare+candy+locations PDF link annotation
    • http://eko-inwest.eu/upload/file/77269250309.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/niguvarokofob.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/murexedodorojebeto.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/guragolagodidadokuxajaj.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/difibewixomapefaka.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/gukumibetufe.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba129b9e0b2---wekozosulonuforugufik.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/s5j6teg26788lf7mu3b4v56stp/tanipizepajudidibu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0l7vas8oij41kbvi9jhmek9tu1/tubabebisawoxixawemugo.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/vopozinugexitaz.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/1vjiclcvnbqek46eth4a6ffah6/89088275655.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/94971702762.pdfIn PDF document text
    • http://pinetreerealty.ca/clients/55933/File/33769655401.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d076d0a4ff307610a3d3dd6a338df24b/8306192016.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/14468970998.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/56575257265.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/sufizokutor.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/76552734783.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8130c3b6a6---91589374263.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/32943656287.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/45580eb2fde54d65710e4c5c961fde81/sunoda.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d7a7be62a---90515243727.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_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 18712 bytes
SHA-256: 14cc2a9dc8fc67310d819e187cc6b42406be88c3bfcc00f3e2527d1554110417
font_01_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 10844 bytes
SHA-256: 79e89408be110c6e90aff75a9af9b946277b332fafcd4fa77f7062d7540c3a18
font_02_sfnt_off00012e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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