Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a61dd8cea594ff…

MALICIOUS

PDF

92.4 KB Created: 2021-07-04 23:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 77ff756f85983604f34b72c0b8cc274b SHA-1: 7f2640f5c2477f314313e65e9210b4171f51fefd SHA-256: 69a61dd8cea594ff1af724db22375cdfcdff46662e9d47c7a9fe97e5d9945a1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the document is part of a larger infrastructure for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://cructi.ru/uplcv?utm_term=what+is+prime+composite+number PDF link annotation
    • http://box8websites.com/ckfinder/userfiles/files/341196575.pdfIn PDF document text
    • http://lblussana.it/images/file/23614954568.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/82140646953.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/getodox.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/kidoxofed.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ap31uah2ldun0nqplmol64it5s/majobopaxagu.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c628f681---31306403999.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e103b51d0e8645a1b34cb00019f3834a/13753380785.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/wurugiganu.pdfIn PDF document text
    • http://texmet.pl/userimages/file/waripenakajewenugidiko.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/lucgap4absi2g52l9d4vg1j762/45526545102.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58d99c3f63---49126004154.pdfIn PDF document text
    • http://aimic.com/userfiles/file/vasolodowovenon.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/15250740836.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160883334451e1---lemenadomaxavatoku.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce0896cf45---zuselovasibidagakewalur.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a1e90c2c4be8041e48fa1fbbffd740d0/fufuveweliveb.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3b6d0e968c4623399d2b333f4d1d0dd/78839406183.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/vozulenavolejejat.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/dijaranutagoz.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9de04d9574c423e459aa33f6ee4ea1d5/pozusinupedatafatugagu.pdfIn PDF document text
    • http://iphysiology.ru/upload/jusebubewuzesekij.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/i4jp20halg134uf1sht26q48b5/50083316999.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5707ad3ca---63010388836.pdfIn PDF document text
    • http://coffee33.ru/archive/file/vunupaxetosal.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 10824 bytes
SHA-256: e13ba248c5adf6b078ae7d76424459010c5263d78a25919f3727593c901eb29a
font_03_sfnt_off00013469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13469 18032 bytes
SHA-256: 5affc1ea9dd8a1f0af6792c2325680dfd00fa4c01508c52b5232466e22c6cd63

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