Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95f415ff1d72ae5…

MALICIOUS

PDF

89.3 KB Created: 2021-08-12 15:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3487a40eb3ae9cd2bd72b2c40bd41327 SHA-1: 8f4d35252326a7c6ba8135d038d7fe99eca69e30 SHA-256: e95f415ff1d72ae5cc5ef1d761b6a29609c1e103f7a7f5982941d68b840032cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other unknown hosts, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification confirm its malicious nature. The presence of numerous external URIs, many hosted on potentially compromised sites, strongly suggests a redirection scheme to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dfed44bdf---64107004655.pdf In PDF document text
    • http://altaprecision.com/userfiles/file/37652344449.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/1031527400.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b753aa1122f---55523974187.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160846f27bdf3a---juxivavagetepuv.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/75425442630.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/95312045573.pdfIn PDF document text
    • https://medtek.vn/storage/file/bugidaxubopasur.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/e859a114d896a3e6ef1bed6a99a3cce8/retenelebopatov.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/da9ovij7d930c3q59pm6ltefmv/rulezo.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/xuvolubajituvagarekaduz.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ad788e79dde108f9282b36818e3bb73/zedipokusi.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/12d29e347164b67c25e983af4a718174/42461809144.pdfIn PDF document text
    • http://aps-mes.com/files/file/wanixezogitoturon.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72a5826f7f---9492657795.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/50529574035.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d8f68549b---57754124451.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c176da6d6bb---73921810016.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/nudexoxekiramo.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/79f0abb4929f03c40ddc90a0bf5daa0b/gujufefujifife.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/dejotofu.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/likomoxupupixebokopew.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4389a7794---buvot.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/vabatejufuxuge.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/81955088419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+unlock+icloud+freePDF 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_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 10408 bytes
SHA-256: bd3a72ab306b334842ee202d0675a7b0e84694ce17fd246032c78253391e4966
font_02_sfnt_off00012b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B52 17128 bytes
SHA-256: 43c6b31f1574101d626c1d95cb010c3894d4b11e50824fb9a9d715b68aac820c