Malicious PDF — malware analysis report

Static analysis result for SHA-256 a409e3e68742a65d…

MALICIOUS

PDF

92.8 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: 3fe8a592cee4215b5328a913e0a82445 SHA-1: 925228d04864981c08f2e8b1a2253562ee5127e9 SHA-256: a409e3e68742a65d735103f44df9787ce172370b66b8ec0fffa627df09679207
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting it's designed to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body's reference to 'bts idol mp3 free download' serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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
  • 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://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
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bts+idol+mp3+free+downloadPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

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
font_04_sfnt_off00013f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2B 16408 bytes
SHA-256: 83aba11ec9ef68b663d2bd7701af6804992dedb75da02635b67ae46df3aaa48c
font_05_sfnt_off0001555f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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