Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3924cd7ca2147c1…

MALICIOUS

PDF

72.1 KB Created: 2021-09-21 18:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 33c237012b89f26bcf18f0b946fc1e0c SHA-1: b7ac08d3015d751c004fd20d9fefe0843f478632 SHA-256: a3924cd7ca2147c19450e8312226751093e6aebde5d475c5c9b0e26c9b4718f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic findings strongly suggest this document is part of a phishing campaign, likely using spearphishing attachments to deliver the malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7475

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://synerhu.ru/uplcv?utm_term=one+piece+video+wallpaper+android PDF link annotation
    • http://33podarka.ru/pictures/files/pokorama.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/31200225671.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/jitovijemuboxesajufiw.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/46500858415.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/86e7f9dfe3fe77ad7d79593af38937cc/51211897715.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/41554412677.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146046bef439---xavobit.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/memerekezanuxutivakun.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210920065952.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210916063010.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/tiroposoxawiva.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3cdd7b1a7004d3769f35776870eb0e5a/26715092135.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/9ca458f7dd357ed09d71b2c4d611435e/62105619418.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/22856705369.pdfIn PDF document text
    • https://wildnaturetravel.com/File/28121650132.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/97070716614.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/rijufamujabiko.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/lifolixopatidixunepawim.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/tabuvexazopal.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/64349886361.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/doxalululubujov.pdfIn 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_off0000c346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC346 10416 bytes
SHA-256: 8bbb041278247e7a091116678719b83a00469c2b5eeb48c90c4c54db13d01819
font_01_sfnt_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 17340 bytes
SHA-256: 1546695be3deb95b0e6ae2f637043cc35f5454522af7339b23930f1d68f29577
font_02_sfnt_off000107da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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