Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f912d9af7dd9d1…

MALICIOUS

PDF

88.1 KB Created: 2021-09-19 08:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d0e1e73f01c95dbacfa340b4ca459f92 SHA-1: 8ef45e2dc38c64e25e0705c7c4c5841108758a3a SHA-256: f6f912d9af7dd9d1972835db5dc0b4b55136f1657232e7d4792f132bbf3227f4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a link farm pointing to multiple PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://uforoi.com/app/webroot/uploads/files/81513753913.pdf In PDF document text
    • http://tanabuauto.com/js/upload/files/filenepodano.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/rulodutosa.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/33404132461.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae7b8f3a8---fejuxatuli.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/9650501247.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/24568831388.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/75822285843.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/s7sd8una9236it3q79bsut11v3/gifokezopebokazatinad.pdfIn PDF document text
    • https://majubesar.com/contents/files/14159112947.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/69639196780.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/63777950449.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/127ego7l8po8erid5ov6pffk8p/betobebobekotadi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613180b94afae---23259599073.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/74630362905.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/60246538231.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7a2210af07368b4d35672c5f35d8db8e/gafabek.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/39447805450.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/nerabelifaxaputuritikiwun.pdfIn PDF document text
    • http://thegioioto.store/upload/files/28860137726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=latest+miui+12PDF 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_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 17904 bytes
SHA-256: 838fdf0c0c2c27111296072d50d0e36faae44e8cea2e807eaef5956fac432919
font_01_sfnt_off000124c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD7 10128 bytes
SHA-256: ba6f654e91e60bd23d86eafe7ac736c77d3e62de402ec7bda4760e855ce30250

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