Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3de969887df3e55…

MALICIOUS

PDF

79.0 KB Created: 2021-07-04 22:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b499d53af842b776648c9de07da2972f SHA-1: a1496a2f96c6005e639e58704dc442f35dab1833 SHA-256: a3de969887df3e55d5dd1b3d976b307c234d2ae71d6e45b528bb523461aad401
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of 'utm_term=download' in one URL suggests a lure for downloading content, potentially malware. The document body is heavily obfuscated and does not provide clear textual content, reinforcing the interpretation of the links as the primary malicious component.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://moje-stranky.eu/userfiles/file/31199684857.pdf In PDF document text
    • http://mimpishio2bet.net/contents//files/durudagivuxuse.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087748edbbde---dugexizadititepuk.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc2d37aaa---67704780098.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ecc13klot3cst909blo3d0pfgc/42823954922.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210704_064253_9570.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/78637789973.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98371aa6d---97992044291.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d148dd6e18---mudewe.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/36fbuleg8lfh73h125umnniud6/87730378913.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe9fb7a1c---43368628450.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746eefa1396---burosimi.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/fafotubimetajidi.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/piramafuwerekagadupeg.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4491a8d39d---nomeridatelemililamunuf.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/jolujoboj.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/binike.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/nulemuwuvujuwafuxavafotek.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077b96a1fa5f---filaz.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/69800704097.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072afb859b1e---mutivejaxukavajeneteluvu.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/ca60a0f735eab7959852eac6f6a3a64d/berirudivasisaramunimoko.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/34466847825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=download+power+book+2+episode+6PDF 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_off0000cea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA8 10896 bytes
SHA-256: e3aea60ed5fdcc5f31ac88ae3e40853df2ba86ff21d9f34fab284983ef8dd995
font_01_sfnt_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 17404 bytes
SHA-256: c53ca9244878bb461a1e2a608a0597565047cdd0e276f89a86faef9e035bb631
font_02_sfnt_off00011545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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