Malicious PDF — malware analysis report

Static analysis result for SHA-256 05aa4165ed1eb6f1…

MALICIOUS

PDF

73.5 KB Created: 2021-08-31 17:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bcdc9a515527de77c0c0cce0e169a96f SHA-1: f7fcdee4c57701d17bf31912b6644b32121829c2 SHA-256: 05aa4165ed1eb6f1fd59fb5c39b5285c7ed74c494d25c9eb9b6a2345fdea6900
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://huntic.ru/uplcv?utm_term=how+to+calculate+the+slope+of+a+perpendicular+line PDF link annotation
    • https://china-glass-mosaic.com/userfiles/files/20210622_125513.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/quvgjhbf1m5gtugpma6vqppknn/jubopabuwiwekujirit.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/86930525105.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/21630397420.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/dusaworemagifos.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ff9193d4dba---91017953351.pdfIn PDF document text
    • http://dzbnf.com/upload/file///rozobukewolomate.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/bimovilewalogewovikig.pdfIn PDF document text
    • https://cristalensi.com/public/File/41570047398.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/vegipevu.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/60101841564.pdfIn PDF document text
    • http://chira-med.pl/pliki/44194979408.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210703103015.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/20796812414.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a676add232b---wetawugerajaganadez.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/45712479136.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c74cf605ad5---kizerizebudat.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/gepaneb.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/pikuvesebupogakosin.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d564447f30---rirupisosizelutobujugoze.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ucol1ipc75i5ca39v3rmsn0mp6/lutefejabel.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/97762678834.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/pesoru.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_off0000bcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB7 16300 bytes
SHA-256: 5e0313439a2c749eca2f27462bfd7ed36afc6987982ea1babd6c023762df9ac1
font_01_sfnt_off0000e5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 10892 bytes
SHA-256: f2a387de5e71a99247602ee5d9e1713395c24d4385ef67dbe752053a1d0fea06
font_02_sfnt_off0000ff28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.