Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40312ef5dffe978…

MALICIOUS

PDF

72.4 KB Created: 2021-09-28 16:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f1254339864b69986195d68b662190cf SHA-1: 1359a261e59255020af5df36c8f0fe3064c76926 SHA-256: b40312ef5dffe9781ef428b373b627e56eb82319d1617d750442a55a2384e6c6
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 and a machine learning classifier as malicious, with ClamAV identifying it as a 'Pdf.Phishing.Trojan'. The document contains numerous links pointing to various compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://badischer-kunstverein.de/ckfinder/userfiles/files/vufenonebarumotax.pdf In PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/9132298915.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/12661561125.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/nekuvibujumetetokozobuso.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/33661703757.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e33d8224f5---61398552423.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9a958d5c7---jewawejokutedudulukudibep.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/nefakowinipit.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/46088409052.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/jiwezugaberevejim.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4e147aa18---70823882932.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/69413978225.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614361f11cacc---vatetojizasomirukus.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca7e91cf5---40109802474.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/faa983f9107d5bf5beda7846db26b8f3/77408716016.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/xofenune.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11523015845.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/nasagirogepifubas.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/14469160969.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/zaludepazusanofiraro.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1132920c0e62623b46b96a119b76995a/depulojekufiperiz.pdfIn PDF document text
    • http://ihdbd.org/upload/files/80146818408.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/faxavavotubevuju.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/55094784266.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/f7057d9a9a07554c8c7e4b5e7b71d64a/29004965478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=vidmate+apk+download+install+original+downloadPDF 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_off0000b6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ced8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED8 16252 bytes
SHA-256: 4f7740e3191e6f7c7fcaea84c9dfce59cfca96f344a5e6b9f0e3eef3f5139ae0
font_02_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 10884 bytes
SHA-256: dcad40aa42133a6c7fbccef7ce7a315b626c3882ef2f8aa98aa11b9a1c5d1cea