Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fd48e276d1b588…

MALICIOUS

PDF

82.5 KB Created: 2021-08-23 10:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e0fb59945884177d449304cb62af1c7f SHA-1: b6dce0e02e2ee620ff483c6fbfeee2474be488c0 SHA-256: a0fd48e276d1b588e8b0fd24ba8438ee8bba00749a6ac725c95bd2820cc6565e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of link farms pointing to compromised CMS uploads and disposable hosting, along with heuristics indicating urgency and password-protected archive lures, suggests a phishing or scam campaign. No scripts were extracted, but the overall structure and heuristic firings point to a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://goteneplast.se/files/images/file/11635955672.pdf In PDF document text
    • http://hurtglass.pl/upload/file/petevefir.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca572172d1---dalixilemezalolux.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/sixebibuz.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/lawur.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/nokoki.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/64673935252.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/6eu829tf7r4t6q5c9b0l4a1uie/46389975216.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/watixapoje.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/40932def26551acfd75e8faded669ab5/66109164055.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/dilatufijurego.pdfIn PDF document text
    • http://grupophi.es/uploads/files/tumejafawodeli.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/81431984246.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/zilogitawotikezuwasavub.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab58d22694---kekonumojafuvoz.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/dawujowo.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/tetexagasesuj.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f557971776---vamekojumegobaroxed.pdfIn PDF document text
    • https://whitesal.com/data/images/file/4969_20210730184810.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/2552728087.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ee9cd67a0---binizelutomon.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/82445200752.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/54886285092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=association+of+environmental+and+engineering+geologistsPDF 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_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 10868 bytes
SHA-256: b314af3b80214cddd8efbb8b328d8f9709c470d98362c7cd0e7eeb5aac20b0b6
font_01_sfnt_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 17468 bytes
SHA-256: 054a6c7d74caf286662f8dbed9e3a20e45dac93215a4b52923c906ae57cc08bb

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