Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cef9614c44de61…

MALICIOUS

PDF

92.8 KB Created: 2021-07-08 10:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 50414430b020f2f50720c201e5a6fda8 SHA-1: 77bf60e746b8ed7d0220de4b3004038760d229e9 SHA-256: 22cef9614c44de61dea34c94f4f0136faa878504d8b562c74b496e1f3d5a0761
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates this is a link farm on disposable hosting. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the structure suggests it's designed to redirect users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a30bd2a775---rilupugilubi.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97177613fd---gujudejemikepiwoxasudodel.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/gizaxowokazife.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/51709249134.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/kunigijubirugagosevepev.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/6b949eb0a5e0d8669d576bd78f69399d/30086156692.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f64de655e---40937743053.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/pupazawesumukumexisom.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077565662cf7---lerijawikuzekosabotoga.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d8eae584b64d96fb52c309697d385215/49001318286.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a092cd1a0f---fazizelukuxuketezulul.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/milufuvoxedesemunow.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/kubovuvut.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090aef27819f---jazebuweferusuliruv.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6126c2f82e---kaxexevovituwipimeduvig.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f914516e6a---vipitejuxadokilariweta.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/66215074796.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/46233880379.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/rogipuwopiwopapuzafazuj.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16082e81722116---10426541366.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/98a52077eb112095fea8d78e93366d9d/wopasonipar.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb2ec75eb---94870183191.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/38312241728.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e324ee6543.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1a43553ee15c003555a7ac896f03e614/sorunuwoni.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/zofejobaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=verbal+ability+and+reading+comprehension+by+ajay+singh+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_off00010661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 17064 bytes
SHA-256: e85970ee045a59afac10cdc8d41df5a331168b29ae33cee0793e6478eee2d377
font_01_sfnt_off00013313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2A 11420 bytes
SHA-256: 28bcc4218ed4f554e3850286b36a7f7ab7cbf12ef6c47212e543a35390be89bb

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