Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc7f1ec551caacb…

MALICIOUS

PDF

97.4 KB Created: 2021-08-03 10:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 867564898e35b460f743a90e826b1dd9 SHA-1: 2abf933c79f6cc01837854d87255444af27bc55c SHA-256: dfc7f1ec551caacb1a3e0f2bad352cbebcc29fb4ed75936cec981fc1d2f8e0f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a link farm pointing to compromised CMS uploads and disposable hosting suggests a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://embassyinvietnam.com/webroot/img/files/33114383101.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1963f3bb002eecfe631f256333f8fc22/jutoful.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/db05ca54a7ec0c454ca977ec30579e7a/7032350844.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/pqhjie7t3sts2l4lotbah3d8uo/13418227322.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/dae08f75ae5a4923178eb852ef437356/komujusinedug.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/96999636738.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/g22nn22fsfsgm062ue0npjj884/mixozalazokitiked.pdfIn PDF document text
    • http://vhktn.at/images/content/files/38515074289.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077207465c43---54860704850.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f0a772dc7eb1f9d98273e63d42ab3931/69000179396.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/13752636060.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cbdf193a3---98681753892.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf2e75000---89832006511.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/81333705822.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9de60c571---sitivikuwezis.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160881a2736386---wolidavanodizawowom.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/tosujubebopime.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/pabati.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/72olfne4ls5dsh7rd476bdfkte/45756288628.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/99660696403.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/h9bv8cmo1kq370emrd0j7kg2m8/tixomivovabetenedod.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/33334204806.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/b9o85r8bmmurbdhsnoinnhnfh4/57187844872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+reset+your+keurig+platinumPDF 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_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13307 10976 bytes
SHA-256: a7512b1e32d841fec1bd85cb79ddeb319a7e8dccc9a4e8d79ae67b91212ee0e7
font_02_sfnt_off00014c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8E 16720 bytes
SHA-256: 0860f20dd94f79d2a0131dcce47aa1fdd70004999b911df6ec5735e7b24cac49

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