Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a07534d5aff50bd…

MALICIOUS

PDF

78.1 KB Created: 2021-06-17 22:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 651a29f8dba0a68e522517c521730bf3 SHA-1: 07a680e0901cb3700c73f661e52e73652aa88969 SHA-256: 2a07534d5aff50bdcd2f4bd01e338ccf514a5800f0f5caf2d61207e46fdc1f2c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript, which is often used to download and execute further malicious content. The document body and numerous extracted URLs suggest a phishing lure, specifically a fake free download for music, which redirects to compromised WordPress sites hosting additional malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9514

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/4ff09eb778875640f4f56b891611905d/fekirizamuwapunerujunuf.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfcca0d275---42368330589.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/baluxetalekifon.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c53a59938---3998174169.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/1t9je8s611jej45ogovm6fjmfp/xizol.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91fac7d3d5---12590454913.pdfIn PDF document text
    • http://garderoba.sk/images/_file/58360262768.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-04/images/files/tabasibimu.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30e856df1b---wamiduvurewarasozatimona.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c1c25096d---77405978938.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106102351397386637ywga1.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021052616582073499.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/89927993600.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c7c247218f8c083a3f014a547513a0e0/2901516915.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/6skmqlju0jfqilpnjgh2knc252/biwaguweke.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/15439495393.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bts+idol+mp3+free+downloadPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7C 14600 bytes
SHA-256: d3ad4dc374ca19a1efad5a46698e04eca8b0374079d92b2de53330d48fada009
font_01_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 5280 bytes
SHA-256: 1c1de2af58803bbe2438d913628897b9302a53476ac855d40ae5678a875987db
font_02_sfnt_off00010b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B67 2664 bytes
SHA-256: 6c4112839bf73bb534bf28a9b4473ecafcbaefe99540199f791660c656eb9c0b
font_03_sfnt_off000116df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DF 11712 bytes
SHA-256: 0fa77daba127e40bf5d2ca1da1b02ea0f0d7275653193c60b24dd7d4b9040ad7

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