Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61029a12bcb5540…

MALICIOUS

PDF

91.5 KB Created: 2021-09-02 23:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e62c8d21c2a3c1ad0cf837e5c3dbb66d SHA-1: 1bab060fc10ac78748ed72ae99dc64c8d95ceb4a SHA-256: e61029a12bcb5540186ff1d64ac29db8108c84ce9b4f4a122e29e5908ef5e5ad
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-10044376-0', strongly suggesting a phishing or malware distribution intent. The ML classifier also flagged it with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://griesvoegwerken.nl/UserFiles/file/tagaxazoxagutaxe.pdf In PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/fd7vte4vrithve3nuqn6nvi416/93897950617.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c626236eb---lusudenog.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/80460575306.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/48614834405.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b76569190d3---11621261708.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/tusurigef.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/fgi34b083atrgebkhu9gc1ltkm/dufafizulanerozonitojug.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/45148325410.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/94045891031.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/56605501227.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607217e7cf6ce---zolulavegox.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/dinivawupetobako.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6a864f6d8d977f0c9e74a17c017e42c3/pubiganikafojowezolagewil.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/ziwumajabizowiwi.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/tuxoreposogepijok.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115ac0d6ee7b---mekidupibisosa.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/julum.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a819583f3---babum.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c574fcdc87b---batirakabegamutaji.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/popunovoruboguwesov.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-8/file/LwpCms2021_08_23_17_57_23_5713.pdfIn PDF document text
    • https://marigabung.com/contents//files/zabopuvudop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=makalah+etika+pelayanan+publik+pdfPDF 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_off00010694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 16096 bytes
SHA-256: 815d89f6cefdfbaacf3d604ff39594b5d9ae6bf3b68ecdf6d32997f82361214a
font_01_sfnt_off0001302a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302A 10644 bytes
SHA-256: a6a9458e384e4d3f0a8b0f59b17641ef78915622b15ea4fd579e4b3ef301a589
font_02_sfnt_off00014836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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