Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af240cfbcd8502a…

MALICIOUS

PDF

101.2 KB Created: 2021-10-16 21:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 97b277e036a5a3bf00e8ced05f285ed4 SHA-1: d51c962bc1360dc3175a834864f9453037144708 SHA-256: 7af240cfbcd8502a1149c2fa5e636f0b9c129457f52c7d73319636e8424ff9f1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on potentially disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=meaning+of+amethyst PDF link annotation
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/25567450226.pdfIn PDF document text
    • https://avela.md/userfiles/file/xikidojekubusanosipisefe.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/banixubogodafativevava.pdfIn PDF document text
    • https://datajournonepal.org/files/22137013607.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/96590311227.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161544a3a64d82---281510107.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/munomiminirusejaxe.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/26bfc9ccee0426976e50ed3b2ff60d84/69245966728.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/12663754526.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/nisodupomivilubofumuw.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/gumadasabes.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/zigakivaf.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/75099800638.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/22041092701.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210916093601.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/29209099901.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/xikozusejemonilej.pdfIn PDF document text
    • http://etre-belle.su/images/file/75524555583.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/setirurevo.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/89571604745.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615fbf19c3cd6---jigajowitezipibiwijorinim.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/80773339031.pdfIn PDF document text
    • http://inphilong.com/upload/files/86910334323.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_off000125b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCF 10620 bytes
SHA-256: 42bf0642b32f0d58d4eecb6f8a1043094d6c7e79c4738adc1d744b877fb32924
font_02_sfnt_off000155ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155EE 19336 bytes
SHA-256: 83b9ed7c03760cbcc2157661e4ddcdea508213f0b4b0099afa2f416bcbb6fb3b

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