Malicious PDF — malware analysis report

Static analysis result for SHA-256 462d0371c3128829…

MALICIOUS

PDF

82.2 KB Created: 2021-06-30 02:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f32f3e02621ef51ff2da78d374fc4bc SHA-1: 4797bf9b38576d794804e35c7f45a99703bc7d67 SHA-256: 462d0371c3128829ea4dae00bf587c9946f85f41b29541d66d8e6fa7f080b263
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve as a link farm to redirect users to malicious content or phishing pages. The ML classifier strongly indicated maliciousness, and the structure suggests a tactic to distribute further threats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=ratio+sums+for+class+7 PDF link annotation
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/hnk23f3lgicf57klhs1qbao1lu/43776769266.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/70756788985.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/uddhkeofa3e9jrkhikscdmm7c3/28304684255.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/15889396810.pdfIn PDF document text
    • http://hotechike.com/files/files/36790594470.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073e99c42fa7---889809666.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/7109d166b1027738f4b1c8a409c4af4a/64112620253.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/bulebona.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/s404ucadv07m4fj54tvcpr2683/74479320290.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609082bfd3d73---wuwetinoxagesizowobuz.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/35178006981.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/sopawereji.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/57924103604.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a875aff5b675611944c24cb2ddce8eb0/99824959717.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/fokavubexejovapur.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/278b358037ca6c7120cb5e662254bd53/papipuwonezugedevasuj.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609148c8f00c5---datonafim.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41b3ab8c2---31638748788.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b1c96f81f---70166660066.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ib5q9p2i0trbl090isujas8ivm/67409417410.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/30298586011.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1cb2e51d1cb7ed7e12bb4954acbef33b/93929945195.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160876f9bd9f34---39439127008.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_off0000df4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 10456 bytes
SHA-256: 9a05549b911abb8d31548cef30724b366eef41c407c944aca291bf8ef163ceb8
font_02_sfnt_off00010f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 17072 bytes
SHA-256: c33be58a1a8d0426ce7fee8d3e12a704800143f9aad66771e639e4c591a82aea

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