Malicious PDF — malware analysis report

Static analysis result for SHA-256 434bfdc8b3565ab6…

MALICIOUS

PDF

85.0 KB Created: 2021-07-13 07:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4e353c32324270e3c6f3c7eec8135d8e SHA-1: f06e477b17c58f828bfa1e8d296ba40e25db8c0b SHA-256: 434bfdc8b3565ab69fa465f73a85d3637cd2e33ebdd2b43d7ade1fbf246894b7
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links suggests an attempt to obscure the ultimate destination or to leverage multiple attack vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://theelementrama9.com/userfiles/files/bekuvavilinifuxilafinoje.pdf In PDF document text
    • http://kapelski.pl/userfiles/file/bebaxetidiragif.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a44f9cec4---zegefunotu.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/zuzaweva.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/n48cn446k5iok8s59mg1c8q1go/30106526506.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/98075da290e6cd921ff4e040b2759f25/85950425160.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52778c1d4b---66594875553.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ba2d816aba5fabb21287b97913208fa1/30476450721.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210621011643_ggjz9o.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1542ecfcabfca5896dd878499355d80c/nikomazo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hufh8v3kgrctmi2dvhlqq18ue7/13181614376.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608885944c166---23566257155.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/topodawura.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/88qqd5itb299mfq69oh1ela9m2/buranopuwiwi.pdfIn PDF document text
    • https://maturana.cl/upload/file/xitexomofovawizew.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c2dce2949---wabovabimefamufusezo.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d0f69489f---84643104583.pdfIn PDF document text
    • https://codecs.ro/images/file/zedusanebabubo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de70be754c---37284872046.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607affa323c82---velexusoridasolupabizujig.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/67725474188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=eating+and+drinking+ability+classification+systemPDF 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_off0000e75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 17780 bytes
SHA-256: 6720d07d43281c7c5d0bc8fcbf425048cfeb71ea54d93f630658cb8f9a03a60c
font_02_sfnt_off00012cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBC 11148 bytes
SHA-256: 19cf35490dd42e37cfcf6a32ac7111c0f00d057fcc2c27d7da5d73211276fe05

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