Malicious PDF — malware analysis report

Static analysis result for SHA-256 729be6d5f8c0d18e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 11:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3350a2067326263e2c5bbfa01761079 SHA-1: e410b268ab642554104b85ab8e8965180d285c57 SHA-256: 729be6d5f8c0d18e186d4bd6870544aeb2c98c703e196411cb53d300a300b91c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage, specifically WordPress sites. The embedded URLs, such as http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613037f103ae1---rasinenonutirunigazimi.pdf, are likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613037f103ae1---rasinenonutirunigazimi.pdf In PDF document text
    • https://carsen.sk/editor_uploads/system/files/64576507605.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/xusenim.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/japut.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2eee3e11c---59647396099.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/43527360323.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/22940310021.pdfIn PDF document text
    • http://asja.ua/userfiles/file/26948895945.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134341088255---nepagajojipapoj.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b30f032cf---kajatubekuri.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/mavofevirigepexiwumunev.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e1a092fdcac96de7ce3990a2872ea078/roguxinud.pdfIn PDF document text
    • http://carbonelite.ru/file/kimam.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • http://canxetaianhduc.com/images/file/bunejezotudoxonati.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/87761888640.pdfIn PDF document text
    • http://iwort.de/userfiles/file/74123374048.pdfIn PDF document text
    • https://nomortiga.com/contents/files/40166421988.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/86793582622.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/gamuporavix.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/joteguxovopa.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/lanimugidubulozabumut.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/57184187406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=offline+android+football+gamesPDF 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_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 17428 bytes
SHA-256: 4a8ff28ea08743e764ff0c7929aa006b9d726dfc9dfd79d1628ca0ffd3a5d457
font_01_sfnt_off00010ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12809 10860 bytes
SHA-256: 586562bf06d4858d9e6a3650e4f683732d0d4a0630ae0c47d76fffa74845ab2d

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