Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ecd1b42bb43c6f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 01:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d5ccccfc71c114f6442aa4852d61e66 SHA-1: 14731b48ba9655b5754be5e0c7d9e365e61a4b87 SHA-256: 11ecd1b42bb43c6fd9fed070668aaad6dd599601b4478cab5efe41ebc3546fc7
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for SEO manipulation or to distribute further malware. The ML classifier strongly suggests malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://tai-group.com/upload/files/20053854372.pdf In PDF document text
    • https://sieuviet.net/webroot/img/files/14482962874.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/vopatulanosulajifopure.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/74639102542.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a9f174709---60181433609.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ce36163914718850e6e8fc081c8d1fd2/mugoporidawifudapisaw.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/bf27141fad5a6ec7ceaee59092ea6b3a/34385378033.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/tuvazexofegozufanov.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/elrld19k41g3s2nspopn4439v0/80017183240.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/36653461081.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f513dbe825efd4a7f689d9e5983b5185/38842191862.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1869d1eab9346129d4a771c299923580/vaferuwed.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/41247664375.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2c963f187---romaxabalurejavezuke.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/3c174d9e743b98de9648299918d3a931/repanepitaluvife.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vbci8034nn5eecpusg0g73a056/49802945025.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a9047b80ff57d2a4f66a0d32ecb327fe/9985948396.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/v986q6mcplhgvrlgc1ldmmdp6j/vubemowigomegulel.pdfIn PDF document text
    • http://etrustmi.com/ckfinder/userfiles/files/81824619897.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160befb2f14285---sijad.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/lominikovevotimixe.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/mofima.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202108070513531224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=colin+cowherd+on+aaron+rodgersPDF 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_off0000db1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 10668 bytes
SHA-256: 0e5b9e0dfbb222b948344fe1bb664eecc75ccec95f6473cd711a98bcdc9cbd30
font_02_sfnt_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 19440 bytes
SHA-256: 2a352a5add5a2f00f44c147b7f0621ceb310c43fe6028fb74e0a25661a6d4018

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