Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61229f2682442e9…

MALICIOUS

PDF

91.9 KB Created: 2021-07-05 21:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2d523d2cdd4fa36330bd3fbff537734d SHA-1: 85374a72334f4a5ad37f6b908d297f2ecc182828 SHA-256: a61229f2682442e95b9f6930493856fd738890bf2d1320710da7bd2db049d34d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of multiple external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fiwojilutaz.pdf In PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062011024773499.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210601062633.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/xuliwav.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/52usvdp7an6t7fc4j3fkvc1m1f/85453516368.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/sujivavagolika.pdfIn PDF document text
    • http://furniture83.com/upload/files/wovadosatofela.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/dasusokamipu.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/sizipukufomebadevivasuk.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/muwudotatikufu.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/lejaxigijenetidolenulutes.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2fc841bb4---gapexak.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/52281142463.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/fe071ee323a4a48a4b65146c09dfd8a9/55362174103.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/21660690769.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/gatekilalekaninazer.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/96930523123.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/xonopotominezadetuvupilup.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/b0f39229d4a63beab64abd9ffcdb8056/35386128805.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072481dbfa48---22421129528.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d14aba89---gelonawajapopolodegag.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b074a1a2bcd---81158630957.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f038bbd38---gigozovopebelose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+long+does+it+take+for+your+background+check+to+come+backPDF 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_off00010069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11880 11444 bytes
SHA-256: 3ee9036c8aa2359406fa98e16ea8ea804be3f22f0598d7246364668359447a7f
font_02_sfnt_off00013334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13334 18108 bytes
SHA-256: f5b651b3d68c49b4b1a030661e837d43c0f8b778a50d7ca655c7667d5e0a45e4