Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d51b388d0d1dd3c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-24 11:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ec08c305ed77ead00b06afa61f064c14 SHA-1: 514149d38573a91f7a69c538c04b253520eadfe9 SHA-256: 7d51b388d0d1dd3c6532f40b3a535d57ea8a8e3e1064c67b9dd86caf2c0fee02
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to compromised websites, including a link farm on disposable hosting. The presence of a 'download button' heuristic further suggests a lure to download a payload. ClamAV detection and ML classification confirm the malicious nature of the file, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://philabc.ru/uplcv?utm_term=latest+miui+update PDF link annotation
    • https://zzwgjx.com/d/files/52628537155.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/tomibejesivemanitinowa.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/migunusopazasinunif.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b63362ba8---5766574710.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303556af702---13625743241.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/mivakafavavakiguzisis.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/tosaxajudesuxe.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109051019187757.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/99525682431.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/fasozezetuwanurujalotutij.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/migatizupoxavukomewar.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d7c3dcd8803b97ed5df511cccbc64183/niwogapekovowimo.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/busulexen.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/taxoboze.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/korutuwesunovenoliku.pdfIn PDF document text
    • http://headrepublic.pl/images/files/pozegakowuzupun.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/48977093315.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/karesesisa.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/58000593590.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f364ed7897703f094277e06913f5cb30/jovomitufe.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/fodaja.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5f5957c1d---bezuginosagifo.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_off0000e824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 10240 bytes
SHA-256: de17e39cebf60a53c4c3bd247560af195467ddf000a2dec115b06bc6d7f1d999
font_02_sfnt_off0001173c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173C 17748 bytes
SHA-256: b4204309082c4ef0b7b198c7cef067a8038854059369a71b28f5ed48c72d2cd7

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