Malicious PDF — malware analysis report

Static analysis result for SHA-256 549b33568db674f7…

MALICIOUS

PDF

92.6 KB Created: 2021-06-18 04:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1455fe22c7d55125a9b64fcea30892ce SHA-1: 8f31c3b2afdb00095157a1264f2bac9ab64d556e SHA-256: 549b33568db674f7302e3696a5f71eb6b9215fba88b71fedef39664fbe94dad8
156 Risk Score

Malware Insights

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

This PDF document contains numerous links to compromised websites, many of which host PDF files. The 'Writing task 2 latest topics' lure suggests a phishing attempt to direct users to these malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/5vl99dhj6agn14df5kgbr3on1v/xewireli.pdf In PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/d1063e72e52c2fb225b9cb021eda9feb/60506051793.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa2980ed36---19219462806.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089098c7381c---kebapeg.pdfIn PDF document text
    • https://p87.hu/files/lugipovefef.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/8ca7c1fe46b254306fae553eebe953b8/93924358543.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4db033888499498b52e8b372bec97edb/64386910292.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4ef523006a0dbbbcdb1bd77e52b7c64c/46619115000.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/09634e07dfeede67bb6ea0d7afc895ee/46262864672.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/gq4kgahg775m5r05vlt7ihkpo2/raribituwibaxijuwo.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/6099198601.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/sibaduligum.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/padofiroxozuxofab.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e970bfc53---laledezonewexemalalaji.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/lowenepomatenitetidapi.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/d07f31e5d958d4477f39561c3a501b99/5125368630.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/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=writing+task+2+latest+topicsPDF 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E64 5308 bytes
SHA-256: 6cfa5c8d4d3a16c59d03ec29eb661062c7676dab98336ccb6c54b0458e8fe3e0
font_01_sfnt_off000140a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A0 10140 bytes
SHA-256: afb7be8cc785805d7764d22a62f8af616476512d9ba981308f64a65ce2c1b9bd