Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca8e110f082722f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 21:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28030245782b24ff67b3afd8b1458b3e SHA-1: 1d2f35852e222eaefa22c95322a3a0ef49c2100c SHA-256: 7ca8e110f082722f7e1f962da90be9fa072ec7a276c78f2c6c8b2b4fea6e4aea
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress installations. The ML classifier strongly indicates maliciousness. The primary function appears to be acting as a link farm, redirecting users to potentially malicious or SEO-manipulated content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/aec5b3ab0b17c5dd126bdb5d6d103dea/vokimuzin.pdf In PDF document text
    • http://oreade-breche.fr/userfiles/file/90647662413.pdfIn PDF document text
    • http://erictex.com/ufiles/files/venifokulewote.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbba988e61---wiriniviganuzebu.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/berep.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d81c8c6d2---51362816382.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d925094a0---98641080187.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/0ee2981a3c4d274c904db5af3e98fcff/lefapis.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160836da8ca055---19646916360.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/30021179031.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/38290220871.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/dsn0i1qp6o5bld4rvn2spa9mcf/kedopunedefedaloli.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/lugulix.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210523202744.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/50417332851.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/kufetu.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/94385756314.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/72275706328.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160814c927bd50---verepewifodumavabebu.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/lujefijozikotilewilebo.pdfIn PDF document text
    • http://facades-et-traditions.com/actualites/file/51680293170.pdfIn PDF document text
    • http://teraval.cz/res/file/wesipovaju.pdfIn PDF document text
    • http://wamer.org/userfiles/file/ritivogewoxukikos.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b10d33a979---84783293726.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/77b9d2c4d2e0876fe944b051e24c4bc0/8162332951.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210617171024.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/1e45b31decfffc608677cd429200921d/29889477432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fees+synonyms+in+englishPDF link annotation
    • 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_off0000d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 18288 bytes
SHA-256: 752ae0f3db29678f18f2591e774e1323db3744aca817ed7e23a145656e9a1bd9
font_02_sfnt_off00011d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D41 10284 bytes
SHA-256: 92cca30909c400a1ff95f19115c96e965e068133add15e34dac8b77943307f14

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