Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d00a0c2fb575adf…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 15:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0da2b809937c2d82b2b079f2e01c5337 SHA-1: 3fa66b2a5c4eb3e9e2aba7abbc0ba0f69247cc93 SHA-256: 3d00a0c2fb575adf6f9a935578331c18cefeebdcb6fa7faa9bb3fa31c5b5fac7
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. This suggests an attempt to distribute malicious content or conduct phishing operations by directing users to external sites.

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://efsanepin.com/calisma2/files/uploads/47529055205.pdf In PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/77468444264.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/jizexedazu.pdfIn PDF document text
    • http://charivne.info/images/file/lapinem.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109060053405680.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/vidojusurufunowexe.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/zogarodasugopome.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/86994436284.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391f041cad2---lolivexexowalasakejomasax.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/muzimowirexuwosidu.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/xawajaru.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/tazipapurisufuxebib.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613940597f244---90437506358.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/zogosorifok.pdfIn PDF document text
    • https://mimpidia.com/contents/files/sakubinopujaxobujenojewo.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/43709909767.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/83830061313.pdfIn PDF document text
    • https://desco.scp.hr/files/gajuzinoludiwugokananepa.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/78584671430.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/noxaridosuja.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210902010017.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399992bb554---14985844539.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/semivim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=green+camp+lakePDF link annotation
    • http://irodori.kir.jp/files/file/54168139970.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_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 10188 bytes
SHA-256: 97ceb13d6edaf15ed735e9faa63fc39ffcb73a1c6f2b608e4f94daeb8b5e9435
font_01_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 17364 bytes
SHA-256: 51324a2366a38ebe3d823109fe03f0a692b1d010413b14adcfc3ca1e2af5050c
font_02_sfnt_off00011f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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