Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd907e15dd7680e…

MALICIOUS

PDF

85.8 KB Created: 2021-07-17 11:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fdc8be3200806c6702aea80d003a1c85 SHA-1: 43094d86f8cb784b88067e94f8192c6ff6ba0a61 SHA-256: cdd907e15dd7680ef4731d6909354cd3dab2566b21dd8a524cad791a16aadad8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to multiple unknown URLs, many hosted on compromised CMS uploads. The presence of numerous links on disposable hosting suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f50436bcbfbca1ce3f63d249795ece45/jewukipavajetudone.pdf In PDF document text
    • https://unique-u.biz/images/uploads/file/nudalovadibivivofokun.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7e12a743b8f18bf9c6a984d0b6d44296/fadenuvalax.pdfIn PDF document text
    • http://patroha.hu/file/lumabavaruxamipozalugala.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/51923994923.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/fukesopukaxoditenoxoxez.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c18d5e9734---74943290183.pdfIn PDF document text
    • http://hanleyresources.com/images/visisebot.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/tixuxurato.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f387c27335c618660aca4bb3702fae73/mozuxewaxumuse.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/3205940295.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7c0a0cc3d---92325357062.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/c329eeb477e747194ecf8fea0406277d/turatosodif.pdfIn PDF document text
    • https://esz.jp/img/editor/files/75999000304.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/dufer.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af53d13dcc---92885815813.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/94d031836de20f4f136aafb7e36f93ef/94907687395.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/bnul9gcclmkrqsug9cdbm6554c/welupetosevo.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210617035745.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/40354120969.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a39f7196042---bawinedanosorizoke.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/foxogemaxekexu.pdfIn PDF document text
    • http://citra.cl/userfiles/file/kexenovesulitiminimuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=approximate+normal+distribution+calculatorPDF 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_off0000ec3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 16928 bytes
SHA-256: 9623e0db7344a1c69cc58baf7bb4d2bef636db0e556c0f66908aa8b9205c6b31
font_01_sfnt_off0001186a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186A 10996 bytes
SHA-256: 0a45d5d0bab3518c3b4e4b9b49095a784a7a2f92d64ab4188ff489f7b0c39ecc
font_02_sfnt_off000131ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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