Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87ee24a7bd0f1eb…

MALICIOUS

PDF

142.0 KB Created: 2021-09-15 13:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4975efab2256b0421e0d3ee34458f9b8 SHA-1: aa068a7f8904668b47b60ab529ecbb6049b99233 SHA-256: a87ee24a7bd0f1ebfc018f11c33a60c548fe94518c045cc5c7468ebba853a8ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents attempting to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://pyccenter.com/images/Upload/file/badadida.pdf In PDF document text
    • http://mevlanaasm.com/resimler/files/sijas.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/robuzubodelabazej.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/66360715799.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/cb6213c83da7783f420df9decb9178ed/9652167066.pdfIn PDF document text
    • http://hidropro.hu/upload/joziwibunegimi.pdfIn PDF document text
    • http://wdnederland.nl/file/gejexej.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/c463c675460db715482eeaa7a1493256/bexipejuzow.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/xesudebeki.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/batofosufawugadazusanu.pdfIn PDF document text
    • http://adice-area.com/pictures/files/firuxu.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/51780811551.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210914080916.pdfIn PDF document text
    • http://wajl.net/img/file/2021915172020.pdfIn PDF document text
    • http://word.mn/uploads/assets/migozozopodemopelijepi.pdfIn PDF document text
    • https://hotelcorona.ro/files/22455548109.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/67165527164.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/57017766284.pdfIn PDF document text
    • http://fullx.net/files/junaju.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/bdbe037fabecb681166149513561345e/sasekupitiwawepalufi.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/xixakevibotadajerijipi.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/8046290298.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/liririkuxutip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=supervision+managing+for+results+10th+edition+pdfPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD38 11360 bytes
SHA-256: eb289eba65db913c7aa61fccbba25a5b469b8cd719227c15515b00dabc135895
font_01_sfnt_off0001d792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D792 22380 bytes
SHA-256: 098ce0081382fe8c9f2753ec473475b27db3c98751822b829e8e61a1e4ed4d64
font_02_sfnt_off000211bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x211BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1