Malicious PDF — malware analysis report

Static analysis result for SHA-256 231d7af5ce9e2796…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 03:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd6020ddd6b8f7fa55eab24fffdafb63 SHA-1: 244951be35d8c521ae6ecd0344d4dd1fcf14211a SHA-256: 231d7af5ce9e2796b21c84d1a3d61ab25db36502aacf89ed6bc21f61596f6d6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The URL 'https://ketchas.ru/uplcv?utm_term=theme+installer+for+android' indicates a lure related to Android theme installers, likely a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and link farm indicate a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=theme+installer+for+android PDF link annotation
    • http://www.thaiboat.net/image/upload/File/xazovekalineremafe.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/72424269714.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613590bc930ef---34772470461.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613965a834721---64315051859.pdfIn PDF document text
    • http://ranchobg.com/img/file/86742666936.pdfIn PDF document text
    • https://parkettworld.com/upload/files/pimasesujikenutubadova.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/52448128341.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/xavifidufisetakopufuzepe.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/lirojodogobo.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/debiwunujubudesezuxu.pdfIn PDF document text
    • http://boldogelet.hu/media/juneg.pdfIn PDF document text
    • http://jljemc.com/upload/files/mabuto.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/28925354703.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/97563508865.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/kuvutaganufiri.pdfIn PDF document text
    • https://pellevah.com/upload/files/52667344397.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/28856188896.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/zavot.pdfIn PDF document text
    • https://andana.us/files/files/wanexika.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/tigaled.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/nedokoxunipudoraxigawumed.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142b639129b1---kevozodogajunuxemoje.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/35251443034.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/sezekefinujaduvuvuke.pdfIn PDF document text
    • http://hingliltd.com/userfiles/zafejekeropogiki.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_off0000ca0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 17860 bytes
SHA-256: 41a160180cf56657c6fe5af686ae5ebd2cf5e2eea31d430199c829bf7e6f3b76
font_02_sfnt_off000110a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A8 10584 bytes
SHA-256: b4de5c9756b958535ffb6d6099fff569da3a1766ee2b2b94294944daac7f884b

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