Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac624bbee42864b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 13:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1bfe0795a01964b2ad80d3a949cea4f7 SHA-1: 382a712d61837135ae0d2b4465e7c044abf328be SHA-256: dac624bbee42864bb147f001f6e21f9ddb5a6a6c8f04adf4f0a981d3fd0dbfa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=reduce+pdf+file+size+without+losing+resolution PDF link annotation
    • http://langfordfinancialservices.com/userfiles/files/88130755934.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/79481585448.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/69547681893.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/penakibidomipoziroxaw.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/qjrek8185uodm0ojnptm8bcl25/13865700932.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/39886481756.pdfIn PDF document text
    • http://honda-vo.com/upload/file/vudikokatemariruwurupakup.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/22450686573.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a772a746e90---rapijolatesedolamo.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/82111115931.pdfIn PDF document text
    • https://doitoutdoorz.com/file/MT7lDFdbsP0VgmK3.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/43581733453.pdfIn PDF document text
    • https://chptravel.ir/data/file/36499412987.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/16170418571.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/e7dnml8n3hei8lr4kp5bq0o9cf/jorifawujivataxixameki.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6298982ef7---20318200155.pdfIn PDF document text
    • https://okazionche.com/files/23873272615.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/mamamunolifafujezi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f48b9e563---68977616056.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/bdad174c6591b53b0b4b6f217a9c7026/58800725456.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/72478733763.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb00bc1291---58840735703.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/96450599581.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_off0000e36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 18396 bytes
SHA-256: 373524273c3df3a98a805f4b14e2039b8e9981fcc8f067fbc0f49e4afc4428e8
font_02_sfnt_off00012aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEC 11028 bytes
SHA-256: 35318ba3108963743f1a875a6f2fb15f10c7d905707c3a041c236a1641d619af

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