Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9ff27372440ac5…

MALICIOUS

PDF

149.6 KB Created: 2021-07-26 05:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 14edbf4bbecdf42343736d5dff5eb8bd SHA-1: 9204e8a551a5822e12654c1d00c6a7a94318772a SHA-256: ef9ff27372440ac58b272ee0d182f5c3082c412bf72aee47fa9a47980f4102ee
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the PDF structure with multiple external URIs and link farms aligns with techniques used to distribute malware or conduct phishing. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9750

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://baikalspring.ru/ckfinder/userfiles/files/wolofuvisegaripituxamaris.pdf In PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fc1c1680a47dfc37f375313e2639fb7/jilidivusetupaje.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/79110942601.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/17107922002.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/04c791873447486467dca19ddb656f09/97364302275.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/jabarifikivulibunarigobew.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/7709109312.pdfIn PDF document text
    • http://bptramptour.pl/files/file/22048801247.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/68387806729.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607111893a2fa---64429231801.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c67b8633ffa---23223971355.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/7a79d8039c2df3d83ec8c57f480c5b7e/sapisoxexibeporigaf.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/54061110662.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160edcd263e08a---36198895293.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bef9ba350b---99291498223.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160756831852a8---roziretajegosolurer.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160adc37e5981b---daforip.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/62rgutqe8ckp1bmf4v01rufbt4/jebubu.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05664f1198---wuvovemenafam.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076868cba4f5---vosimazovafewirewaketebes.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/nrsioa19q6aejj2f9tbg0bkd9m/nejugekalegudonabopa.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/99b48b50e1d6b118ecabf7776af9e48b/16463775927.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/punodedumelufu.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/87709759313.pdfIn PDF document text
    • https://petala.gr/userfiles/file/muzupekojadufogeledi.pdfIn PDF document text
    • http://rnsnider-classof-68.com/clients/9/9a/9aaec9a1f64917203b32d8bba7bf2533/File/64966645241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=resumen+del+zorro+y+el+sabueso+2+doblajePDF 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_off0001e485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E485 10928 bytes
SHA-256: 3f7d3f1fea2406a9441f89955f57c4f07891eb0ec368a167ff3aa4fd37c503c4
font_01_sfnt_off0001fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21602 18380 bytes
SHA-256: 7a05ecd377f9d99eae956260c2eda8f53577d5861507e4243fb50ecfee6ca7ea

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