Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77f1af43787a1b4…

MALICIOUS

PDF

73.7 KB Created: 2021-09-05 08:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 159731d202b3b50fe5fc49f5d28fed6e SHA-1: a5cc201afe20a33a3f66ea5e38422c9c539e5903 SHA-256: d77f1af43787a1b48e5b1396f25b100a314c04b802aebfcc960030caed73bfa8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.disbel.es//ckfinder/userfiles/files/39441639761.pdf In PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/60906749282.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160de5a9fe9fd6---guxipuza.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1lqg3vlc87kmkge0dls6b4q37e/20601233894.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa17af0c16---lulilanotatosa.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/nucdj9ml98v9351tlqnq3ircu0/vatoduvesotowazemom.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/49c01e7a29aaa9748bbdac9c09255fd6/19916962724.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/7jn6hggs0hb4s286b30sbgap4k/xaxexowemineloripel.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/dakupum.pdfIn PDF document text
    • http://anm-av.de/uploads/files/tipaputu.pdfIn PDF document text
    • https://everestart.com/images/stories/file/levobiwipabobobew.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/53140423894.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/502b811745caed9070ae4170300f0348/lobepagume.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/sizanu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160820b41afa28---81404878669.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/varemimosilonad.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/57590522099.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/56991440311.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/7305485415.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/fetadugesinesudelar.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/getalasegidazani.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/vasatimuzomajagi.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/void2roqq4qeijmg452al0vk29/felamajepaleg.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/sosavesabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cell+cycle+worksheetPDF 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_off0000bc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7A 17740 bytes
SHA-256: 8fb64ead155967ab01d12c11aa6d5897de857ae90a5a09c492b94f538c691d29
font_01_sfnt_off0000e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 10292 bytes
SHA-256: fb505ea9b9f1744706554d925fb1da704c614863d8a7fe0e810998301840c3e2

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