Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f8cee490df46a6…

MALICIOUS

PDF

75.2 KB Created: 2021-09-04 01:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d6a02c90a0c481935f19bf3ee03a1cd SHA-1: 15fa20ce44d75f2ef353640fc2c73e85e68c2202 SHA-256: a5f8cee490df46a66f60116db3f1f5a980e6493139cc26e4dd6702fe98a95fa2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The PDF's structure and the presence of multiple external links suggest an attempt to lure users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://lhorizon.ca/uploadHorizon/file/87317238455.pdf In PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/fumaxofomatim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20c99e1404---17904781200.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/69049657298.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612aedc56c46a---59990793638.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/79020446010.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/766193802609634f135a85.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/bea8b97f45ba069efe3c633f23eccba7/goravapajap.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/58615356896.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0fc3bf150ac4ca59d7bb357670d56ee6/29215475779.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/mulupilokedefovivozig.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084e9892579c---fobuxukarakavagupojukara.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210806_2A00B10384A3E67D.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161329fd4a51a2---nuxadesakotosaguladipas.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/2597296556.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0e97dae6e---47032960622.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/19036875687.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f86b47da1---tusegipe.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/susexolezirizosuxabal.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/rovafovibunu.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ce2917725---lilixufidijobu.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/59366974392.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095eaedf23ab---gogoseguz.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e43888574b38a818097752c03e5ca7a1/nurebevezivimupuzimem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=canned+meat+products+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_off0000c24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24F 17048 bytes
SHA-256: bb8b04aeddb75331385bd97c2722717a5b01d7b9f4c1466efe9e9a365c9b6c25
font_01_sfnt_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 10776 bytes
SHA-256: c5f0d210a46f0a46822aa62d791d7e75e7e4f12032ec2549b4834e1c1f114061

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