Malicious PDF — malware analysis report

Static analysis result for SHA-256 79404b7608809135…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 03:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ccc617b789c3c7aefe8ed677a538db1a SHA-1: 52a9d4849c38840dc6f485d381873a5bc2adf7b6 SHA-256: 79404b7608809135aec4b71d905e2a1e7ef33957dbdb7023ff3c8459a6b679d5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The primary function appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=foods+that+have+aspartame PDF link annotation
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/kugagubikiluvovubojujap.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1627787426_eee682248c.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114750e16bd8---82619224404.pdfIn PDF document text
    • https://matratva.in/userfiles/file/vukixudixagemafujabosikoj.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/tanoviwenejavovimof.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/88109752565.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/84331439780.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a8ef6d3c5---bofokavu.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/6489dde65d61a996ebc641f7575d12f4/1161885155.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/damaperimedezuzi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4fdf4b634---956574966.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fac759de263---femutikizom.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/susin.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/mvqt9f2pb5o36gvv7fe0nb5j2e/lafezepekowapewixixuku.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/467c82d8e0c36a98f66b0e3a84cced8b/purojomuver.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/bekesuluxoveg.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/64228472608.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607131b7c8d06---bubapogujumibinutekiran.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/91748683254.pdfIn PDF document text
    • http://ymmicro.com/files/files/kegafubusomiko.pdfIn PDF document text
    • http://kudusde.org/resimler/files/mipifejasuxibi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075ca24cbe21---71113577666.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/nepejakajuwofu.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_off0000d0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E1 10460 bytes
SHA-256: 7ebb9b8c45d3cdfd27f638156b6bc098f4ed2d40a6fe8c8719bfa31c6c2a4c58
font_01_sfnt_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 16232 bytes
SHA-256: 7478edd24705773146133692ba9d4308fef6e84b8c9be2fc70712bca06e4196c
font_02_sfnt_off0001122e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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