Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca780cb4096f9cc…

MALICIOUS

PDF

69.0 KB Created: 2021-06-12 06:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1a92c588c9783bbcb038b4d9f82d81b9 SHA-1: 78794741442c05fd9914e2abfb900f74f9f46dc7 SHA-256: aca780cb4096f9ccf91a0b574cccd201761cf2cdff03f8282974ea81acf75551
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress upload directories, suggesting it is part of a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains text related to downloading a song, indicating a social engineering lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=download+song+banno+tera+swagger PDF link annotation
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607be91062cc9---suturugoxeg.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/10576758815.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a7119e98ad1---53604151650.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/d8657e99b45607714ae457cb7e27a302/13258712696.pdfIn PDF document text
    • http://www.heksan.com.pl/file/jewurozapunifosi.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/xolanufefukifamebaran.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/2a8d4e0a48e6af3b8a271a5ad1ec9101/kopurojosemebiroreze.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160737189588fa---295000581.pdfIn PDF document text
    • http://akssert.com/userfiles/files/32238622187.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/5q7j24p2cqn3nv396u1hsa92g9/jajelukewisinof.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/52bd8f978b2e64b10ffe0b369c522f2a/jamaneg.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/1d6ep02nenjviq0dgq27oe59lc/wejulorexobogeresawaz.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae66562582---vinoloxakarigekelala.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/96066530788.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9d0fe2edf50864a490d7a0803ee1296b/25674312030.pdfIn PDF document text
    • http://artospace.com/pics/file/28918637425.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a3f661a7e7a9d549affcd2502da12129/13628403713.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/8fa7cb9b731362eed9a625e7b2e0265e/44554390827.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC48 5224 bytes
SHA-256: 12ffe12ee3a197feb03d21ff3267165dd2e09c4e93a4187596673349739c1bbd
font_01_sfnt_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 12364 bytes
SHA-256: 8c31568799ee07e7cb96522abb51f13ba419af807d049b3abd4447d8d802cc0c