Malicious PDF — malware analysis report

Static analysis result for SHA-256 9277d95e0a1f506f…

MALICIOUS

PDF

83.3 KB Created: 2021-07-07 21:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 766635804c80361c05906c57e9b670f7 SHA-1: f352fa82fa0d54e8a1d6d0d687f9a1e51fc7c1c9 SHA-256: 9277d95e0a1f506fec626ad3ceeaacd6850b2afdef449f43b350b8c7cf89a59a
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs on potentially compromised sites supports this. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f5d478397---gajazeziruguruzavulagedep.pdf In PDF document text
    • https://digitaldaya.com/imagenes/file/xepapomobuxemedujupuza.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4daf1e19e8ea857fc1b6413f7e9c2518/fogexilijagatelurekele.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/pofidajakali.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/zexuxodam.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/57fs03hi11ps28jcg9btktba14/16456309575.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/d815rjg5b10dcv3fdjgne0b6gr/27502790949.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/bobumadexezijunedot.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/p07gtqru3a2qlnrvh4fjaggccd/sajot.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be694ea2a52---gipusa.pdfIn PDF document text
    • http://balone.net/_upload/file///27986036063.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091be7f50fdb---12970594709.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3285ee892d---22410672432.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6a097996a189b19a25b9d2e99b5eef3d/24628484496.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/4e9f252dd3b743088cb6cc87ea800245/63786301264.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/62498302585.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/vowibelagiranolu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b59123ac63b---jilakegakujufud.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/to79bhjklin5h0t31dat2a9b6s/48907634343.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/a7dq4ourrpcpm20vejq7tkdva1/voluwovenisegoterotop.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7a401507e---pafoxafifagedubatinek.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/44190048395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=clearfield+drivers+license+center+hoursPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b71fcc6e2c6---legubef.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_off0000e38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 10772 bytes
SHA-256: 25b447a793bb705e511d40be2727a12be2c731b27498353556b09058932e000e
font_01_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 16756 bytes
SHA-256: 81fe9067d20bd192f38e044f086716581147db338e9ddf6eeeeb1bc2b0fcdf7d
font_02_sfnt_off000127b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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