Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fafb8356b87437…

MALICIOUS

PDF

78.2 KB Created: 2021-06-14 02:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b597fb5e4358d287d1256cc1eb6847d5 SHA-1: 6eabfac7aa15a001064b7479adb71ffe0a1a3395 SHA-256: a1fafb8356b8743762952c3bf6b297cfcedfbd7403af9bbc4195f25b914c467c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on compromised or disposable domains. The presence of 'utm_term=office+mod+apk' in one URL suggests a lure related to software modification or application downloads. Although no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it is designed to redirect users to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pixomot.ru/uplcv?utm_term=office+mod+apk PDF link annotation
    • https://naucharts.com/ckfinder/userfiles/files/83728225080.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/42919775817.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/k2v99npaaombrr3fmb6r1cu6r9/vewojiwolixaxifumelus.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f076d5dc24---77576388223.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/2d29478bc00220196f4f36401dc18565/47608702792.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69d99f3eb---23409456540.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607b912017724---vurakoweloz.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/1204e27a33fe704ed518aaf73587e13b/pogedejenadedujowu.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/oabbnmi926g65g87iinpjfmdcr/gevunega.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/1b4c4ded60d5e8563ab142bd24c36660/deperukifu.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16081bcfa92e4e---76331020211.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a50a34743ce---39368842384.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c4d4ff8f74725245aeac982c24fa0e64/22443827263.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/kuvezupukurazofo.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
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 3040 bytes
SHA-256: fbf95821cead0c0b3950cc9a9ba9ad87bd788ff33ee2401da62e753ef3fde3f2
font_01_sfnt_off0000e7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 4688 bytes
SHA-256: a09ecef8caa29057d28c6dfc701deffb66c33ebfe837bffe4fb75ae8686c6132
font_02_sfnt_off0000f7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 11260 bytes
SHA-256: 64b3ae2c36ac392be6defcda899ebab0bc22a3b3e909bdeebcc28a5279fcdc25
font_03_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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