Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a040a7f8ee9d5d2…

MALICIOUS

PDF

116.5 KB Created: 2021-06-25 01:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c806f7ee86b90e2a5e1540944fbeccda SHA-1: b6dfc91924cdccf49f7dccd680a7ef6c4699a390 SHA-256: 6a040a7f8ee9d5d216be3468c9d287d69872b3c4d3ac9fddf211af208e5b7dab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the heuristic firings indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://smidgel.ru/uplcv?utm_term=king+kong+isaidub PDF link annotation
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2ad5c7a28e0fa703f488bd439f559a48/soxugelovofizuva.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/aauu0m8hnod3cu505m1o4mkd2k/44062745218.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609de91679ad7---danovi.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/b5fccf02f1d86b1aa56636c03834cf04/41666146585.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/mfhce232i5jm9s3de376t50c3s/23402259749.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/99343182281.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ca11287c2aa---zixuletamunoxakatupuwile.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160821669930fb---76890807361.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/j06hqgja0modmkmhf72qo4j1d6/taxob.pdfIn PDF document text
    • http://fitviewer.biz/files/file/lufumuvilenijewimaven.pdfIn PDF document text
    • http://salkim.com/userfiles/file/40791565571.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ace54b0052769cb3a4acd32b5dc2d339/xipug.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/zilosod.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5816d2c0f1---pazufozefogidaninuzinot.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/599347cf16883ebfd01c90f6813b09b0/zididet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE6 9000 bytes
SHA-256: f0fd296d41e84a63c1a9c9541f39f15351766320ae83bda44923e4cac221bd9a
font_01_sfnt_off00014d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D86 5040 bytes
SHA-256: ca6fb16c5bec2faadfe544cd312fc87fd24c26396bc8e23d51e70a9da5f55578
font_02_sfnt_off00015ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBF 2968 bytes
SHA-256: c6cc3ee52f7007ac49a43ba291dd0da3ea127cff4858443caf90506470d9a50d
font_03_sfnt_off00016acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ACD 7876 bytes
SHA-256: 4ce4c536e3dc46a63c3025bad150ccd53b99eab5ca51307d55b13fdc2822e807
font_04_sfnt_off000183a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183A9 12768 bytes
SHA-256: 70ea8c357433a5c4341ed4dd42f661cf1616a5f42caaa5fde2c56c0961b7846f
font_05_sfnt_off0001aeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEB1 16088 bytes
SHA-256: 03928253ee2cb1fef248e02a9a6434000674c6c2dfc7f61f5290e699cd36adc1

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