Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff364363b0d24ea…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 14:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e7340752b2390b1ce044f560cd5bbaca SHA-1: 41b74e1d51a73782ff59adcd429b963b8b765d86 SHA-256: 1ff364363b0d24eaea4f5b6748a5d87fce0012ca55f1d3a46e5efdf70779bd4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment. While no scripts were explicitly extracted, the PDF structure and numerous URLs strongly suggest it's a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=snack+video+maker+mod+apk PDF link annotation
    • http://evopizza.lt/ckfinder/userfiles/files/gamomometuto.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/koroxupeminudezuxoke.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/39802066838.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/xefozapisivivarase.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/3194869792.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f038da47ed---mixevaremijenirabul.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/sabizuniwovosamaro.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/rarajunesarewakamilu.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/52288734985.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/77775019595.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/0d8cd01f03e14c10f4ea0acf5aaf1574/durunawebuwise.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/bopegilatubadazoravolif.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/sugudiwuwezinanenamofutuw.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/kitadudepiterike.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/40311429570.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/dabfb06968dfbf6bf11f1bdf08d01135/48103937103.pdfIn PDF document text
    • http://ahknchem.com/upload/files/36400215539.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/9950926133ba12dfef2.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c1b4413b6---83133917942.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/supuwufejawepew.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210907174324_OTU3OTU0MDA5OA==.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/sifuko.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/geniginitatiw.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/81233151086.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_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 17228 bytes
SHA-256: 81e451bd17d83c3c7ac12384aaaa861c5263114cf4388fb18c321a1788e27322
font_02_sfnt_off00011e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E35 10596 bytes
SHA-256: 53a8c33209b3d5b93d37cd946c80eea0efb02f9af758c11462576d89a7b66b21

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