Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a7ec7676f20ba9…

MALICIOUS

PDF

88.4 KB Created: 2021-07-02 03:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efb02aa59211a1a566dc3c9200f37558 SHA-1: 404c0700bec14b0847b6e72a30289bad7e8e2844 SHA-256: 83a7ec7676f20ba9c5c9f04eb8296318713f144adee7f349b32aa1b735cbe7dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/8cbbc08e65722bd3367ff7a894bf094f/13117106621.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/61c943a1326fd635320f65e450b00692/25217582261.pdf
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/tanemajidabej.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/vudutatiwujalotatopinatu.pdf
    • https://rybczewice.pl/userfiles/file/nomufegamosotejozaro.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607236a74009c---36152326591.pdf
    • https://maturana.cl/upload/file/jofokipiduvofifivi.pdf
    • https://kaptenhoki.info/contents//files/84406184520.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801e1174412---gibelopodadewerukuwasaf.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797190bf29a---newetefapava.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a448226d3d6---78950043800.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b9d45e515d9c2578b4d2dc47c64eef4f/tuzukodikewuzik.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609221568b917---rotumelodajawef.pdf
    • http://studiotrusso.it/userfiles/files/nagubarumub.pdf
    • https://balajihighfields.in/userfiles/file/fibevufajosana.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4697df0873cbbd379fde752487507f82/61100444694.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/acc335c1a4ef27037b90dd15879dce11/pokamelofirom.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/kibidalusakoserirux.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce246ccc2f---lafepupamobe.pdf
    • http://hitecds.com/userfiles/file/vufax.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa9ebc00ec---tonevabegilerofavukajipi.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efad631b6e---43337140015.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5913c1a64d---71274141817.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c28f952c188---difoxunekizofalabononono.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087fb3f6d6d9---nuwovajupejupud.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=catching+up+to+do+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7ec.bin
f4e9c6da88b02798d60ec55fbafc64d6bfd20aa11a1fd3cc7de0f7cee82f4a43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 16948 bytes
font_01_sfnt_off00012418.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 16792 bytes
font_02_sfnt_off00013c2f.bin
5eb8ed3a40224f6d276867d0302966e82e5ba67f8c54b2dbc89e5229195b3ba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2F 10780 bytes

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