Malicious PDF — malware analysis report

Static analysis result for SHA-256 117418bfa47b4ebe…

MALICIOUS

PDF

98.6 KB Created: 2021-07-09 04:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e7b5b18822e164f54ac5d579d246e596 SHA-1: cda1a4c9bb92fe7b0e635353915d11d1ce122c99 SHA-256: 117418bfa47b4ebea614bb7ca94f4ace9efce9706c8a2519fe6cccf24ac90c5b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and the 'ML_NYX_PDF_MALICIOUS' classifier strongly suggests malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing or malware distribution lure, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cee5a25eb65---47859000729.pdf In PDF document text
    • http://dges.in/userfiles/file/75544462399.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/joxixi.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/49930462519.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/5530656214.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/oaefmtqibi14ggruq06tvbjki7/8265831164.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/74988844239.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a99a07e43---39049479505.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/sozar.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/wogunuli.pdfIn PDF document text
    • https://arerp.kr/data/file///41052682790.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/53999887140.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/c8d2dc66648d9005fd5d40cea1385a4b/vobig.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/20734343621.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b097c72012d---18865003552.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/uclmib4atnkvg6vu4mo1r5pnpi/79294133650.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/gusiwewevafoduwagebidute.pdfIn PDF document text
    • http://prosquash.by/data/86878962066.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b114f54d09b---50023962564.pdfIn PDF document text
    • https://bachson.net/upload/file/687947679.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/dnqfrp363lujlk181go0kc0gqg/79422540721.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/14923570431.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b776b3aef84---43198742960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=high+fever+hallucinationsPDF 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_off00011ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC2 17500 bytes
SHA-256: d0e43614a9f88ce17111b241e8b83a7322493ecff75c08ab23c444a18df00942
font_01_sfnt_off00014c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16453 10772 bytes
SHA-256: 7b2b90cc8efaaffe960365b207a8e190cf4a5d786ea10eec54d756b813498028

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