Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3cf2c0ce7800178…

MALICIOUS

PDF

73.6 KB Created: 2021-09-30 18:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f2f3e98a7f4f7bf6d98c70654e609850 SHA-1: c4641395833769dd808d869012d50806187bc4e4 SHA-256: d3cf2c0ce7800178018ddd202f548fe0409416fdffab652891975fd55319f9db
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links indicate an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://soudurelauziere.com/upload/editor/file/91013604659.pdf In PDF document text
    • http://hzbmsj.com/images/upload/File/53596384971.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/44017223140.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/rarofot.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/navexuwuwitov.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/lobatineriwosizeborajon.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/43675567191.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/dadokidukobunapexej.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16153e926927a7---dirigujivesikijiweburul.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d0467b685---luxibelim.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23325836572.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090309203473499.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/nagakajilizitewisoxogeke.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/59485361892.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/71933715721.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/zimodubofugibenivubutele.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/mUhAOiCepQFy.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/metagozevup.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/gizufanor.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/27585850467.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/kovuba.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161516979005e8---lavufuk.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/ratawoxivijilofuvedido.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/vagimulix.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/xizujezaxemenog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=save+html+as+pdf+chromePDF 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_off0000b7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD011 10828 bytes
SHA-256: f1f76dd68a378ee8332ea69b47e61e7da7ad402b4a217dc8de3a0d6281a2c2ca
font_02_sfnt_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 18412 bytes
SHA-256: 79bdbdafe5b24430f5298e71254e725fec5ebffeda9ad28fb5bcf027899471d8