Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3c2b80529c5df3…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 13:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e6587b594d7c81aea7e9eba0e6c452e SHA-1: 22abbc44bc528950875e4154e9ac3ebfaa1652f1 SHA-256: aa3c2b80529c5df355b79cb1d573a05c3f9b0e4d677ebe7ffc475172a78cea30
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is intended to lead users to harmful sites. No scripts were extracted, but the primary attack pattern involves malicious URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=partial+avulsion+fracture PDF link annotation
    • https://uclerbaklava.com/resources/file/28469346940.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/zufujivafura.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc99437dab---83250243859.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/25761737320.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/zuduvetusiman.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/kmto8bsvg7l9n7sgpd9j32ncef/30011202408.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/92846978238.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/damovanodejoladem.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/vidate.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/90963211715.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/50907217765.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/9fcsug1e9rbkdqc96u4rh15jf4/69667125967.pdfIn PDF document text
    • http://flomojapan.com/upload/files/57332812834.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9a00a2faf---21761507586.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/94081401165.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/n1bbfst9r8lmovrjpngo289ni1/70149848480.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///wejuratitoraxafivekapib.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ha1t1eadc6l7vk9anlq9cjakt5/77506882621.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/dipodapabosolusogalapaxaw.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/80745167737.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/4132352226.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/a3267167381dab86e6c3d82f9e96c82b/dezigutuxuzobamobi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612af74fd91e4---44406437133.pdfIn PDF document text
    • https://regenerateacademy.com/file/16533386820.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/mefaxumobatokebix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 17804 bytes
SHA-256: 13b25c1a5a3c08f7d67409098d9a1db3838e392d52455ec8d5e416f336bd7286
font_01_sfnt_off00010b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12373 10496 bytes
SHA-256: 30d772a2ef287a73ea5019bf13b2adb525e88925dec7a61fc9e4e6898acd9ae0

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