Malicious PDF — malware analysis report

Static analysis result for SHA-256 3edabc21dd5367f5…

MALICIOUS

PDF

96.1 KB Created: 2021-09-01 16:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37dc8bb0cfcf4c8cc8a12660b566e7a3 SHA-1: fed6569a7d0b06f7a4c8ddcaa3bb107c6705d0b3 SHA-256: 3edabc21dd5367f5e5fd6673b541814508c0453ea6eff03a94c936f55c6ddd9d
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a tactic to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially compromised CMS upload directories supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://indiantalentjunction.com/milan/media/pilusiwojigafujazeve.pdf In PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788ad42f2c9---33938976797.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/mizogijudujizame.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/83577555581.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c57b67d4a---34161105326.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/ladufo.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/m8cs1dh04eo2i42gsntel9egjg/15291818331.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d17c99a76---33627237341.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/wujenowo.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/dogeba.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/41c533425da73132ae1c4e765acb33fd/30282849292.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/2384250689.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b4d8a4de2---tavakos.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/datajefewod.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/nemewuvuneze.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9eab394de---46484013798.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/51ee61a9a9fabb7bde7d6555d3bdbc78/jarezazevukawo.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/miraxolokoxidi.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021073017095953.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/96592882625.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/saluzafeliso.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/bofudiwedel.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160943e5c37327---fofovisagojexirinesov.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210701055728.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fedcadf44b---12847040989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+resorts+to+stay+in+chikmagalurPDF 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_off00010e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4F 11036 bytes
SHA-256: 0d5b37920df2c590ec056c3e92e196756a86bf9944c7ed375a35176cb8ad7848
font_01_sfnt_off000127e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E3 18828 bytes
SHA-256: 02767b92126c71f8f1378efbe75fbceb3314cd955cd44f178c0d1d79580bd5ab
font_02_sfnt_off0001590f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1590F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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