Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ca5fcc87e6a36c…

MALICIOUS

PDF

89.1 KB Created: 2021-07-02 06:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5b2708b0ec8a386455db7b789b96ce1 SHA-1: 7572f57a324e6ad16d5dde72440f1356e507013f SHA-256: f7ca5fcc87e6a36c2cec517bcfa32c6f5fbfafd3c8e86029dfa0eb2b6bdafccf
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised infrastructure suggests an attempt to obscure the true destination or leverage trusted domains for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://aromamarketing.md/img/files/jewatisobanavuboponedojiw.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/b5bjgbbpt6ip7qrb54qpnjpnlv/beragivo.pdf
    • http://campfirewtx.org/userfiles/file/61952122591.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160aa080dd4757---nuxogogerivotutejul.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991c9586cd8---80741875888.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609532007c49c---62761498498.pdf
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/90793706985.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/3d0ceae3469e39f43a3f4f110b04cbad/livuvo.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/feb2bfda0cdaec6094f590192f63768c/19663124930.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa86d7b0e2e---53392942252.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a826fecf394---repekelusokinifozavowo.pdf
    • https://ludifrance.fr/userfiles/file/junenul.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3f02d06e40c127c0e1c9ed6b64ddedd8/24886893044.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/2b222a1f81bca4b17acb828ee351e80a/kepimerizebegevi.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf5685c351---nivusumupiremoxukimoxus.pdf
    • https://tranduongauto.com/app/webroot/files/images/pages/files/19328278415.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7604a30579---zusezekudelevefadudito.pdf
    • https://t2sc.me/userfiles/87041695926.pdf
    • https://cristalensi.com/public/File/44495439044.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079730236b92---3978180111.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/roocdmv1snk7663hah00m5vee4/37804026939.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48612a5918---gotodunulewafotepamuvo.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1c6535ae0e8b047f907c3a4ebb0c0e13/21647392299.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=low+front+lax+unrounded+vowel
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 16792 bytes
font_01_sfnt_off0001025b.bin
545bef531753ec110fdab35ef8a5755c6fb08259809bba0fe6b1ea3bfe514b53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 20148 bytes
font_02_sfnt_off00013709.bin
794d083dc54e50d3af6a65fbca13a02d6a66362ce26298135b6f802032174cf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13709 10400 bytes
font_03_sfnt_off00014ec2.bin
5a82188e6e8da9a65a099a3dbe8ac7ee9960ecae6c4d5d3ab331b168cb1b6e87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC2 1684 bytes

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