Malicious PDF — malware analysis report

Static analysis result for SHA-256 e029f91a8f78f4e6…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 04:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96e92f8401506d48e518e5668f9906ef SHA-1: 27416b317ec3d7ed3a06c9376016903e084cb560 SHA-256: e029f91a8f78f4e68239035f81b7789d967ed56a572ae9d00d529cc38e0c1e31
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's primary purpose is to host a large number of links, likely for SEO manipulation or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/b36910015d7f0cb3efc8c67b989b76f6/feneruwipina.pdf In PDF document text
    • http://kameleonhastanc.hu/files/file/wukeketifoxuzi.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/4778624307.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/bac97ef8e5d8a516a2d2ab16fd42643b/soxiwat.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/12567874598.pdfIn PDF document text
    • http://quinta.cl/upload/files/wejokesebazebo.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/62a4dd23a5f8184aa944cf9f65a6d1e0/giluvigobofoxiti.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/zegofolumafav.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086193654024---bevuratigutatajapisopa.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/94352996269.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cc59b8eca4a---58036535577.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a70c6eb5c---gonaxeronenojixuluvif.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/sojojadaxadusakisegoraki.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607239ecb3041---filobabilebizidatiri.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5cf2fbe9cbec58182e21a82512930eae/domefizofiraxuzerejataja.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/98047708565.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/58367550703.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/94535623761.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/49721782007470c26266de27dc43b6bd/zedav.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/jikidixegaje.pdfIn PDF document text
    • https://maviet.vn/upload/files/dilonira.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098b04a2b332---mubesepiriw.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/2432312931.pdfIn PDF document text
    • https://dcimx.com/files/lanejalebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=research+problem+meaning+pdfPDF 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_off0000db6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6B 17504 bytes
SHA-256: 8c1347bdef068c95457553328ce8a42c4e9f9b99e2b432bbd035282f6d0da0c8
font_01_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 11152 bytes
SHA-256: e4538fe73b7cce11c702a7e43754189d7b11d6a1bf3561991ed290e860cb6ce2
font_02_sfnt_off000121e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1