Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89ea47f163f4510…

MALICIOUS

PDF

72.7 KB Created: 2021-09-02 07:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28b508a86f6ee61ccb1a0923e9e54df1 SHA-1: 2a7a079db49f47b3fc00d99a1a9a0343e166de07 SHA-256: e89ea47f163f45100121b210bf6ad5d0a3ac283778a79ef5f5ead567d9ef4a64
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/5ace57c29f47677a4fadf79d79b96966/46317471637.pdf In PDF document text
    • http://pinturasoltra.com/images/slider/files/87203797627.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946ffad51c8---84430489578.pdfIn PDF document text
    • http://geotersrl.it/file/fuwapofukotakidukogosopi.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/45336592767.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/filiwerofusebodexivo.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/24964337823.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/gepoliwoje.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/fagetaxofapeparuxejomu.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210804223337.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/gizamulorosobubaguw.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/42509214942.pdfIn PDF document text
    • http://staropolski.net/Upload/file/finizugavurugotabodibami.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/55b0796c8a2bce02dd95e70e07b8eaa4/livololumagolalawab.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/ronegoraravugigaz.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb6ba59400---37646395678.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/97511097221.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429041500351919.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/diderabojulixopowafimapoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161103d8b242df---44094125018.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/26vil0dfeuir3u6d8qm93rrlfi/24973650873.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vepiwunigixovud.pdfIn PDF document text
    • https://citytrafik.nu/images/file/porokirujafakibovolet.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/luzekedefanu.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///42981517522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=meaning+of+indifferentPDF 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_off0000bc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8E 15980 bytes
SHA-256: 586f8264a504234f34f159d27863683c64221e51e81e4dc2e09e5be27c9dc2cc
font_01_sfnt_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 10308 bytes
SHA-256: f3f921395a71dc99b1a13bc757576d89e6e7341ff68d3d1f9336149b062a21b3
font_02_sfnt_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1