Malicious PDF — malware analysis report

Static analysis result for SHA-256 3109b752dc72c3f8…

MALICIOUS

PDF

88.4 KB Created: 2021-07-01 00:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 53302338c8a1f16d0dd8159cf8681484 SHA-1: 3334e68221d26e8dbf58e425970065712704e8fe SHA-256: 3109b752dc72c3f8f413d4b45a163d1e8c87cd68711ad3544ca5c05fdbe623b6
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded URLs are consistent with a malicious PDF designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://audit-advisers.com/userfiles/file/kiwib.pdf In PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f03aa60e98a1da71988b054c514a016b/vizixijopekipopivenobas.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/bajinironafamapobalof.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210523052021370.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b56736459f3ea747eab7338c3fb59c6/10997436313.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cafu8rlqf8a7d3nqlri8a5a627/85110200072.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fba7501df06155ba8035d4388b4cebba/dunobibipidoninexilir.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609763187876c---46507061476.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/wamofavobanujasu.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa0ec2af23---fipuxala.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/15768480595.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/kalafujutilekowero.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/6381441884.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa171cf416---63089822340.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/66572192618.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/fefad46bc36b4c9a0c4420e8d039be6f/fuwefekab.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/koduwe.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/suduwaseg.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/n6vaf7takq5qjg8mfdnr3de3h4/13722071124.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/052cd28fca42159fa5c85062c6836150/20202668870.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/kajoberuvezirarux.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/89865981435.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/403918ad8d39ef97cb4f6958f9cac43a/37269812969.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6fc9a72e---kuponal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=no+pets+in+spanishPDF 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_off0000f7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C6 17908 bytes
SHA-256: 11154b59a9450025ddfea908853b280666d113cbe4101d1308121b0ff4259b64
font_01_sfnt_off0001259d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB4 10180 bytes
SHA-256: 5baef57ca50213a59b01daaa9b323465cd1a21ec95eaef8eb84c434ae62422d6

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