Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9eeeff53b1ac608…

MALICIOUS

PDF

78.5 KB Created: 2021-08-28 09:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89fad5be16d66b8dfb95dc0007ad4c2e SHA-1: b0a1189a532fb3f5fba8a5f3d6cf8a8cd876cfce SHA-256: e9eeeff53b1ac608454701ed1c79c47e40a868641b1c44e40f3b2a5fdf11b7eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093fefa90e82---zevapirogonimurusaseno.pdf In PDF document text
    • https://raiporjai.com/piceditor/file/43359497654.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/86283380369.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609405b3b49d3---tebabasegubaziwesuko.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/24akuichj8nhvvuibiapo74j1u/77548811489.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/95588873554.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/3943681682.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/284ef7dbb75a65d34c07198441a66264/92716155331.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/1g10p7iu9hicoigsm9pgvbr5ln/xaxewafobudejeb.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/berugeli.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/paxesodumobexinaxapaxazu.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/18005602937.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/oqg73m1b4gea30e354aooscoe1/ramegutotosagakuvurakur.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41e1c5e60---59098171547.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/2045262225.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/dosexazij.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/miwizamegobixekex.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/wawid.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021062719051073499.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611897b9de31d---77634708561.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/6qe4lqltphcro098a9v3c4i2d7/52501052980.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607486cf0f057---durapubawubasasadibatat.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/uiqb0hnn2hg3ru42136n6ienub/18952072740.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ve8bu6tk8s11tav1o0nks2j8u1/80330532737.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c6788e03b---pudam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+sims+4+full+download+torrentPDF 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_off0000cedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDC 16712 bytes
SHA-256: bcb89a07e7a3a20409a9807e5801b748f142e5f51df36ca02604aebf067688bf
font_01_sfnt_off0000f9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 10844 bytes
SHA-256: 6129d56b2717b67e694fbae71fee11d450f89e529307dfad7cbe8b459af3a21c
font_02_sfnt_off000112d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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