Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fde707e57440d00…

MALICIOUS

PDF

87.6 KB Created: 2021-09-05 18:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 414363940cd32a2b8a24758a09dc82e1 SHA-1: 2a6daf58e53996b058e303881531c0efa47adea8 SHA-256: 2fde707e57440d0003a875ee11d6c62b091e646a1110f8fc750367bbedc78e48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute phishing or malware payloads. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

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 https://wastran.ru/uplcv?utm_term=imaginary+friend+book+pdf PDF link annotation
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609757a807ef7---92475755559.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcfd80af82---tipasosewujom.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d4a7e4f0b98e19713b88e24d8cf1ec8a/sabatox.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd8a1541b2---8822000715.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac20b3b0764---godokowurepeven.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/33775252186.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/pegux.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/29158507569.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/32002361680.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/kemokesaxum.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/ratavomabovo.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dea9a6872d---63040659317.pdfIn PDF document text
    • http://taxfreepoint.com/file/fumarakabej.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/29154123673.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/d7cdbc0806620398c88b6e53d0a6c4e3/gegokugomisiwutose.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/2ocfv98nke38okuf53jb1f9a0a/6325305351.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/35339523192.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/15525097001.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/978dcb5ad85f0b0e4bd7eca107ba1914/79370098676.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/nozifevanefagigovusazogin.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f491e36d9---sozuzawibixogus.pdfIn PDF document text
    • https://kawanmto.net/contents//files/44956576450.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_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 18348 bytes
SHA-256: feeb286ad2ad005474edfd3673855aaba79be4bc1c3123b28f37644508bdd122
font_02_sfnt_off00013877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13877 10824 bytes
SHA-256: 61241be26d521d267a487fa783d98040078de33812b7c1a7852dfb8795fcf8b4

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