Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fc2e6af0deb8fd…

MALICIOUS

PDF

72.6 KB Created: 2021-09-21 00:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e44b5e83cc9fb791b9b633558945c52 SHA-1: 6f6f1e98f9821ab8c8fbb8256e66ad8494862fdb SHA-256: c2fc2e6af0deb8fda7803fa1a986c9e340db8483e93d3a7c00e7f51788cfdeec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409186b50d3---banevod.pdf In PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614495449bc77---85454740132.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/b92040eabf81f2e87f2591aa07a8edfe/1190903785.pdfIn PDF document text
    • http://ducthai.vn/userfiles/file/vugojosibi.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/nixexufo.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/vibejixevipijobu.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/gegitazegenul.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/8367532671.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/70697269414.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/povuxi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16147e111b8651---3115421890.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/nonireji.pdfIn PDF document text
    • https://arranridingclub.com/fwd_docs/file/13427115529.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147078992903---66432954796.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/67387842529.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/25041981579.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/mevixekudenabasire.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/lafoxomakid.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/fakivusemezajezek.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477e6b85f21---3967525666.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/korajuzabeluxatijomo.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/47966437486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+is+the+difference+between+an+iphone+and+an+androidPDF 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_off0000b9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A8 16424 bytes
SHA-256: 3c88aa5837d5ac8a87a0bcdebc91fa4a38e0700b04b02e151cebf2c693a73693
font_01_sfnt_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 10892 bytes
SHA-256: 0402333b1a93304d27cc178495e49a53bd182562029e72db10bc612272a3f5a8
font_02_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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