Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e63eccd28a79f09…

MALICIOUS

PDF

101.0 KB Created: 2021-08-14 06:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dace0a70a669c26e83f03b610657d5eb SHA-1: af3b86a813c3b8cf608b5b8faa3b851b6a20daa9 SHA-256: 4e63eccd28a79f098377e71b3caabf8d273f088ae9d349c5313aff5a0986148f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. Heuristics indicate this is a link farm, likely intended to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0149d1d743---pigepigiviv.pdf In PDF document text
    • http://france-ex.com/images/blog//file/vugezaroxuv.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/lenuxi.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/26431726054.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/lasimejigumuloxilukudor.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/piwazazukiwelupasasavar.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/af5a38d771faeb53805e7f7064ce1bcb/89767905929.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/8hg37tdtfo24nuf5v5ajbv3v4m/mibive.pdfIn PDF document text
    • http://hrudolf.com/userfiles/weberararimaxogezijimag.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/81717503977.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/movafulefuzaket.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/28014257199.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/a0f0b1d09bc8023334d1121c6ce14044/48641054205.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/88589866962.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/gubinaruxigobivulogufud.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/33947513279.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/77054507740.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/53337200517.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071cdf1cb263---paretipavilemedufoju.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/puguwonokakesoj.pdfIn PDF document text
    • https://argumentua.com/i/file/42495126841.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/29689093057.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/sexonibiti.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/xegog.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/4eda167b99d8be6d9f6ac38376709c2c/tenasuger.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pesquisa+qualitativa+segundo+gilPDF 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_off00012011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13828 10636 bytes
SHA-256: c9ee558d686320e30a5ad10c6de6734e9b8a2748009e32f7dbddee0bc468e7c9
font_02_sfnt_off00015022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15022 20784 bytes
SHA-256: 8fb2293cdeebcd2fe64b797ac68cb5daa4309815375a84d8d6c8c0a22bcbe3d0

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