Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27589455a216c9f…

MALICIOUS

PDF

93.2 KB Created: 2021-07-09 03:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1bec695ebb306b335f7ec4931bfafaf2 SHA-1: 7010fc8715788d2ed0f171153ba0f60a485c991d SHA-256: d27589455a216c9fe0be32a9b303ec38cf867823efea995b599bcbceb95de0dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://irlanc.ru/uplcv?utm_term=what+was+the+outcome+of+the+sugar+act PDF link annotation
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/cnknq2qfjk9c1oklg3i5uate3a/52573631194.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/fibozixowukadixen.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609549aaaac7a---73222476385.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/fuwovilojadigupofeboz.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/46514183190.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/xedep.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/tujumixubajovivolesir.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/vudipul.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d96cb637126---rerejalubaruminasi.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07d4d8f2e4---tenow.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/zerato.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b553d4d7d2c---warujoxex.pdfIn PDF document text
    • http://ahchala.com/img/file/17422087369.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/79601077153.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a8a119b552ed952e9ed1b2b423c3184f/62627381089.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/fidowepewa.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf097d5aa9---setugavubaxezijibogow.pdfIn PDF document text
    • https://deepex.hu/hirek/files/34887197373.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/80d42b986c9522838a92a9533b85ccd2/98515641754.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/soxukaxebowujoda.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c9194da84---47653844412.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/tajewexi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_02_sfnt_off00011fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 10720 bytes
SHA-256: d1dbe80e7c199d1c1604860c35fd0c49246f45a120d92edf3c5d19aa83c73646
font_03_sfnt_off00013873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13873 17052 bytes
SHA-256: cf2ad9b76ff8fecd0541c77de86adccbafbdc9be9c3ba6572c3a0b4685b1eef3

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