Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3ec517a4e678db…

MALICIOUS

PDF

70.5 KB Created: 2021-09-19 20:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 690e8493808a43b0bd6d7d8e4e076ace SHA-1: 1b971df9e2aaf260b170195477a17879bb1ec49d SHA-256: ca3ec517a4e678dba254834fc9ad91094249aa253598243b3a7646772eab1440
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file 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 embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=complete+arcane+3.5+pdf PDF link annotation
    • https://gruppopolidori.com/upload/image/file/24523085883.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/xozupuselupatoxulope.pdfIn PDF document text
    • http://kisito.com/userfiles/file/tagoj.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d642b622bd133622bdd76a29eca8116c/61152337969.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/ninifuzatuwuguvu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/2c8601404ff08589e5cc424168598641/64776952808.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/mimomerarewofenalaku.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/40461387176.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/1862700948.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/padotiri.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613125b914f30---fapoviwagamodozu.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/jojur.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138734b32d6a---dakisowarapumubaxaxejisiz.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/4913175437.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/74467346583.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/8129533786.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/dujeruretukudisufudav.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/36857262316.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/97454797292.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/14134377540.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/73371168167.pdfIn PDF document text
    • http://espicycooking.com/files/file///85566276179.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/862f2fdac2db4d1d817568fbed08768c/84293919307.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/memirog.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/55094856054.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_off0000b3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC7 15512 bytes
SHA-256: d06b65ec13ea4dcd939119176765d7d0bad63a91d27b1bb838ade2ab5a440b3f
font_02_sfnt_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 10924 bytes
SHA-256: 2f6b5273d62190dadc138ae05a166644079faff7a0ed72389eefabe42ee71cd7