Malicious PDF — malware analysis report

Static analysis result for SHA-256 0329346eac487dbc…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 00:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3182b4aef1b91356b06f7aad8acd9a0 SHA-1: 8515e802cf366b80b24efd53d24b45818e099d48 SHA-256: 0329346eac487dbc289e4c47f32e21a5ffc721b1e0d3285cb41f1afc75248259
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the linked domains point towards an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pistant.ru/uplcv?utm_term=campbell+urology+12th+edition+review+pdf PDF link annotation
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/67551054090.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c878b7c9815---juxibalugodi.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/48b083653212f9a70f77752d0907e59f/84328464282.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/dikiboditinu.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/namubamijozigibovuz.pdfIn PDF document text
    • http://chinalabware.ru/d/files/33852513169.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/fapavakakup.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/80803694676.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abe7afc9552---zoterezevuz.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/ccb63291fbdc16a2a8506f9b282f0429/34730538567.pdfIn PDF document text
    • http://kalikraft.com/images/file/pukixan.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160be58a19d3ed---2394102676.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/eo25nvat5hiqob2lidh7fahhk5/talat.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/4060e5b86c175b00c55cc1f87d795a23/lejelaligoxujelimazisuzud.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e81ed3242---91788574960.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/25cfc4f35431397c508c4325c44f2057/kopatuxirajavow.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f34b0f88dcc---22980176056.pdfIn PDF document text
    • http://benly-carson.com/product/files/90717775394.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609005203b883---12931944461.pdfIn PDF document text
    • https://raljob.com/userfiles/file/52178553142.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1792f21e2---78972077135.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086959ca00be---9926245016.pdfIn PDF document text
    • 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_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 11488 bytes
SHA-256: fdf7e1e4f2f2c7a1d3cdddb8fe0f03a3950de7101113216fcca24d63c6035343
font_01_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 18752 bytes
SHA-256: bf945ce8d6d51fcd72faea871641610019ce0da40601f82f1e5f604b383cc042
font_02_sfnt_off00012fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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