Malicious PDF — malware analysis report

Static analysis result for SHA-256 440b9f5ae90e8f74…

MALICIOUS

PDF

86.9 KB Created: 2021-09-10 17:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e0c0931093e245bbc1ffb0287f6e150 SHA-1: 35ba71b56cc539f5d5f127e5208ba9565e5bb793 SHA-256: 440b9f5ae90e8f7442910206d11c90cfe0ca3d35062352f02a0d1723f10a2496
156 Risk Score

Malware Insights

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

The PDF contains a link farm, a common technique for phishing or distributing malware. Several heuristics indicate the presence of malicious links, including compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://studiotecnicomartani.eu/userfiles/files/15283341442.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec0bf0b7b1---89171194975.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/30080987961.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/gaxusunadafegik.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0ff0c754e4afb20f5401ef059c04bf1e/peroneponasedevanigin.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/24953049200.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/91432135206.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/rapub.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/70953899666.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/bobaxifopudug.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/laronekarinowevusoburu.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/tosubimo.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/fced6a1d2a01bf1c0641233135cbaff8/vetubamam.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/59953211561.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210906225836852.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/18524704625.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/aecc1bf1cf88df4582f7a163b3d10755/topos.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/bc7e38d9d4afa1af13c3c11f0e469e69/nenokokepojir.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/monaxilemumanabapi.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/65935979826.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/pexuxapon.pdfIn PDF document text
    • http://lifo-sea.com/ckfinder/userfiles/files/48538905200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pixar+animated+movies+2020PDF 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_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 18332 bytes
SHA-256: 4018c27ad3e20f51a91803a11b123204625623b2cc3ee88fb3b308268888f347
font_01_sfnt_off00011d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D37 10772 bytes
SHA-256: c8081b0bfae0e0b89a6f4f8b32eea1dc8ea2514424b52bb818f70dd172cc3bfd
font_02_sfnt_off0001361d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1