Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05b149d95321094…

MALICIOUS

PDF

79.2 KB Created: 2021-10-05 17:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d88b3fb01125b39f1ff1d0e1952d1bf3 SHA-1: d4126d88d05bdb1cc52ef807e59c5d2096ea101a SHA-256: f05b149d95321094fbc900402951fd22ba32831832b6511f2b322b4030b08c70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614097221817d---47829267985.pdf In PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/wajorebek.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/31755180492.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210920161820.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/jonutuxatisozakab.pdfIn PDF document text
    • http://boki.hu/editor_up/35974456169.pdfIn PDF document text
    • http://lblussana.it/images/file/18479450786.pdfIn PDF document text
    • http://chineseclothingonline.net/File/28073869415.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/b6b53f1abd01e3eec36ed8c7830dfdb1/nuxatuba.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/83076532436.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/25975761020.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/83664158369.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109201206567561.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/furegiga.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/55588359985.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/87518850321.pdfIn PDF document text
    • https://computerzone.pk/file/zelodosapisovu.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/a41v8n3jsrh3lsvdkh1rjcv1ng/72656277855.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/1954544682.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/31485452700.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/61029365853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+does+quinclorac+killPDF 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_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 16900 bytes
SHA-256: 04d817c481146563ee085df3aa0c70425d7365bb9946ee22e4464dcba1b1cfd9
font_01_sfnt_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D5 10800 bytes
SHA-256: ea57e0e633610fe16b7063e35bc10043310b28a81e5f25ded57cd74ff8a70f35