Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec4b50e831703e5…

MALICIOUS

PDF

99.2 KB Created: 2021-09-05 01:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a38a19e866af62c678cbc20928a4f6dd SHA-1: 89084cccfda066bf106c54031a0f1b157bdc5af9 SHA-256: 2ec4b50e831703e5b67991f0895b3c96b52c8e39566087aae1d484a511100760
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document impersonates a cloud document service to lure users into providing recovery secrets or private keys, a critical social engineering tactic. While no scripts were directly extracted, the presence of multiple URLs pointing to compromised CMS uploads and IP addresses suggests a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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 http://n3ss.ro/ckfinder/userfiles/files/15341198896.pdf In PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/sejenok.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/ruzexujitaw.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/refemuwor.pdfIn PDF document text
    • https://appfacile.it/file/27729570096.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/92996218924.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2ced75857---kejimetulujiwipumonurok.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/duguxivomebemuxo.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b5ea6f36d---74392805746.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2436555b44---4694661961.pdfPDF link annotation
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16096a75834098---fanaruguk.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/20387172718.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/70300279737.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/tipifitegutibavofuzekodex.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/16442797595.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/negapamusosikef.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/kb5d5rker8r4a2cvsre26lrfou/23201739973.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/6599200086.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1630789456845.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/setabemeniparujiwu.pdfIn PDF document text
    • https://wagaskar.com/media/rusamax.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/nebapudubepodukuzelixowo.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/sewapim.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/93157532654.pdfIn PDF document text
    • http://sgpeo.pl/users/file/josaposubapukiwagenuw.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/951450130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=google+ocr+pdf+to+textPDF 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_off00011eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C1 10412 bytes
SHA-256: abfc971b22bd7b5ad6b06714de29cb84ef3ca339203f3875daff534d940a283e
font_02_sfnt_off00014e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E47 18492 bytes
SHA-256: 3d2a8c4dd515b3149f0552a069a9d880f69714a4404c5ab3129181c1dc8d9621

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