Malicious PDF — malware analysis report

Static analysis result for SHA-256 6356bc1d19d07dd4…

MALICIOUS

PDF

85.7 KB Created: 2021-07-05 15:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea00be6fa22c8bb5f06461b70b9215b0 SHA-1: 98955b5bedfb40e89b70282a9c5710b173284016 SHA-256: 6356bc1d19d07dd4fc593a1ed9aaea3e6004bca97a5e46cd34be4f5c4ba92c2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point to a campaign leveraging SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=does+air+has+mass+and+weight
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/icl4g0ers7iul9auikcedk1nk8/2841120090.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f66e314e9df6a062175491fd3b2602c6/40138915893.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/dlj99d8agbvnaulna0gm2ocgc0/ralofaxalife.pdf
    • https://najlepsze-w-polsce.pl/uploads/61650651281.pdf
    • http://www.physedu.in/newsite/userfiles/files/21769099730.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160952ff78204f---xipivofa.pdf
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/poremakujobukekidatezen.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c57c498c2eb---nofixupunatelasabi.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/c0eaj3ib7obocollmotu3nst4p/89012662418.pdf
    • http://beergolfers.com/blog/images/file/54426258991.pdf
    • https://doktor-ara.com/userfiles/files/feguxakafu.pdf
    • https://bbpartner.cz/userfiles/file/fotufexunujat.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/06d0fb0ba6119776ccfd125f57ccb4a6/lemowawaxime.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/zetuzelaxajikofuvato.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/b4504110bc2eb219f85a7727155e5b35/91789081568.pdf
    • http://matras-devison.com/upload/file/bewizitifisebuga.pdf
    • http://elcampoeco.org/FCKeditor/file/94219794335.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1854c682---jerofax.pdf
    • http://forter.vn/hinhanh/file/beluxudejidigojuruj.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608b339a0d371---21296291195.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/inaaj22c3s25vth0mae6q16itk/93213565391.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d06fab660---60425394515.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160dadd24bf7e9---sadakenubinuduzekiximeden.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/67d4f97c17d18e7afb14d39e4d1d0310/58195493944.pdf
    • http://apcmagon.com/userfiles/65510680706.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb79.bin
50018e6e35e2e527fd5baa6c306b62cb84932d4503c705912eacc5c2c619637d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 10736 bytes
font_01_sfnt_off000103d4.bin
4e0bc466c563b42ee0a4c5ed473080634925a3f6a9832eda6fcb656628635b2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 17456 bytes
font_02_sfnt_off0001315b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1315B 16792 bytes