Malicious PDF — malware analysis report

Static analysis result for SHA-256 3484d3ce8bd06ca9…

MALICIOUS

PDF

93.3 KB Created: 2021-08-18 14:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09b57f6d78297820c202b13fa9f3aaca SHA-1: 758482a58723d4a6700055052875cf530b56ef22 SHA-256: 3484d3ce8bd06ca94ca2ddc0790f2f0f0d656f32ee7ed512aa0d4a070268ab25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of using a seemingly legitimate document to facilitate access to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d40bc3e6cba---4368514522.pdf In PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/nexusozet.pdfIn PDF document text
    • https://ptogel2.com/contents//files/92639075908.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/xufugozixulojug.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/jivuwabememokagudunapagut.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5ec1de8e9---judopimo.pdfIn PDF document text
    • http://peeweeslearningcenter.org/clients/5/54/545fcf94abc6bccf175f3035c740e6d3/File/95973471204.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/8dcc1d9308c0131a5e6abddb7c9589f4/tademekalurivonut.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/58f5caace6421fe6cd2075602c45ae9c/67619982161.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b496301190---84737450217.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/deec404d3a7a6d1e0fd308fe49eb6f6b/59722518478.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/86077394193.pdfIn PDF document text
    • http://npas.ru/pic/file/27374028374.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d431ab6fb9---josotalijavaxukofiw.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qkekrv9tpl3scmeb21p3c08o57/95375401130.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/sorejidbv5dvtujronnhb7mkqm/85838465835.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/soraxesiju.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d49d758ed190fccca37467b0957dc990/87025357860.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db1b0e0e053---44763967257.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/27471770011.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe7fb61fe7---54104680162.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/dikowasaxuvekowenima.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/42094111519.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/47c9jq477omrjp5gs9ic49qnss/72074659550.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/b522a7af73a8181f462433e0c5e64c54/38087995993.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ba0145fc3696dc01dcc9fc476bc4e02c/mezedipilajun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=spalding+in+ground+basketball+hoop+installation+videoPDF 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_off000107d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D4 11144 bytes
SHA-256: 94babab8701dbf25c6b1f9a97ac551043a8ed34db61d5729bbda5731e8bf2efd
font_01_sfnt_off0001214e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214E 17148 bytes
SHA-256: b1a14a27bfecd6fb96a77be370bdc7b084224e5fc6e91d1668b28a8c34d880cd
font_02_sfnt_off00014e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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