Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8060d7f35b4085c…

MALICIOUS

PDF

72.2 KB Created: 2021-09-07 16:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cd05efe0dbf0a245d4a89ea1c60034f6 SHA-1: a2af82bbfd241f9bcdeb74c309d15e32b205a6e5 SHA-256: e8060d7f35b4085c566dccbec3b93a3f036205deb47246252432c6ffca458489
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs and link farms pointing to other PDF files, many hosted on compromised CMS uploads. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/839103b9e19823dc900b2fd6916b7355/dekegokitawisowokafi.pdf In PDF document text
    • https://avigailpekelman.com/sites/default/files/file/8756867088.pdfIn PDF document text
    • https://turbooto.vn/upload/files/71042898236.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/62877481279.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd0733158ccb8d7716b2e8b70d699e2c/ribadenijer.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/ganiwoweteroresizigugala.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ge142rbfeoir7q4pcp95c7i3n9/pabafixibivotufipujin.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609286bb20f4b---vezuperepisosikowem.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/ziwilemirutaka.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/nosaxolawijus.pdfIn PDF document text
    • https://medtek.vn/storage/file/pofobepabilovid.pdfIn PDF document text
    • http://freeski.hu/freeski/file/56793069243.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e27ebea981---tunowibot.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210623_024509.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/22728973703.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/78731433110.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/83826899962.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/all66iho5jg7qnp21ptsgsl9f7/56983055622.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/0618106519.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/838f2b207155bc89ee5e5ac714b67d12/doronozen.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/fca4a642e61cfbb1839267fdcfe5b8d1/37375066673.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609349aa756a8---bozewo.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/viwawugafolobinajiz.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/zobevekajijusetelexim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=celulas+mononucleares+pdfPDF 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_off0000bbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FF 10724 bytes
SHA-256: 388470ff2373884e87c747f78521475efd77181e22b16126db861d4dcf305ae9
font_02_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 15276 bytes
SHA-256: 87e0b2a5b4675260c3eb098feebd9190267bf4cbb73c624b98fa1965a4931741