Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32662966bc73570…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 22:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 22a0d4c1c7d4cc1d17a9ecb0f292575c SHA-1: 1c93076aceae6342ca47b19ea080fca1de6e994e SHA-256: e32662966bc73570759819411b925d37fc52156757ebf4a7a925c26ac64678cc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of numerous URLs suggests an attempt to manipulate search engine rankings or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=3rd+grade+math+worksheets+word+problems+multiplication+and+division PDF link annotation
    • http://breakevenpoint.pl/uploads/editor/file/tazonuxuxuzivebeleko.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d36d491bfb---60429769300.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/bofebasedi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/wisinotajawikugonezap.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/72425837983.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/83059277359.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095a76dc0980---poporamuxobomexap.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/daxivibokefisevolilel.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/xewavofovipepanatigesebi.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/88a875f099f7add4d0e40707a9108c20/dumisaturepozose.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/1c98d6900e2bc3d2c324026ebbab2330/xinuzuviwawafo.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/kuporib.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/44659323041.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/zukasokawon.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/xedowekisamirotujowukub.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/zonononilidisex.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05945ab3b---figiluboxaz.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/9025724173.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8b88f147f---wujeledakenij.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdcc6239de---46572547863.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/0ecff1d68473bb3ee6fef158b033654f/sikiredewudav.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///1878442856.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/zaker.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_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 11520 bytes
SHA-256: 6e99b789cc439115080fca3693196546bd6c7569abc13bcb68baa01b542bf4b7
font_01_sfnt_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 16772 bytes
SHA-256: 425d1777ca290249be474979972c0ab43a314c234e692a8d493749de8d31b63a
font_02_sfnt_off0001247a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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