Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f1875c546a3f1e…

MALICIOUS

PDF

84.4 KB Created: 2021-07-07 02:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17f3052dcb28a3a0a38c85c55bb11068 SHA-1: d4a0324bcef0535f4a18f8ecec790f7ff03c6c44 SHA-256: 88f1875c546a3f1eda06dd8a76c625f32cfb8d3482634447989a9da4c27eb5ab
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of links pointing to various websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URLs and link farm structure suggest the primary goal is to redirect users to potentially malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/e24d174a60c6625df1f007e749ce7651/44301036145.pdf In PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160741d19da4e0---rasifodomeramodisifilep.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/zoboradexalefenakerake.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/puzewudiregofekarebalib.pdfIn PDF document text
    • https://abeess.com/userfiles/file/88434477674.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/rnenu7v0oc90bmu35m4ctolic3/vodokunifi.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/39813683110.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ace501ba80f---68605413935.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/98943749321.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/35419682171.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c91720d42fe---98984008431.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f507053eb6---bejofizodavubuwes.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4307460e7---97077392882.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4312b2b5be---ripapugikuluwu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/be47fd593ae978364dd6a237ecc02c8a/16470852021.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/pexaridoji.pdfIn PDF document text
    • http://apsons.eu/files/file/tofugipudimevokatozisepa.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c5504b46dd7cede97e57ddeb71c530bc/46180070842.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/68163783586.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8773aec05---79359746738.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/27929913461.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/m7a0jut0v8d98tfa5k3o39dk4h/59197542129.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/84dce03a161f797dfa2e8f67718fe1f8/35106398677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+you+know+the+air+flow+direction+in+furnacePDF 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_off0000e600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 17304 bytes
SHA-256: 37fbde599de67f8f09c48f16a66ed0aaa325fa8c3e51165fc5cc3ceb185ca2cb
font_01_sfnt_off0001134a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 10788 bytes
SHA-256: 07a9da35bc51f0b39743877f26c6e86918365f11e5a8d0f5f05515087c130052
font_02_sfnt_off00012c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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