Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7c9f77f0f15df6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 04:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3fb1b120bd2fe7eff24a199af61d6b10 SHA-1: 5f004a230a34d0485f821fb0027e931247404fc5 SHA-256: 4e7c9f77f0f15df643a239f7a4763f1d79afe9e0f596ae84e70e89071effe588
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The presence of a link farm with a 'utm_term' parameter suggests an attempt to lure users with search engine optimized content, likely for malware distribution. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 https://medvor.ru/uplcv?utm_term=captain+america+super+soldier+game+download+for+android+apk PDF link annotation
    • https://hijaustabilo.com/contents/files/mizotasagararovejosofab.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/92503712939.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/duziporos.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6bd0a24ce---wefozewamo.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/31077632236.pdfIn PDF document text
    • http://24cvety.ru/upload/files/91017148223.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/podinarobulepukas.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/8ee538519bbad9a6b24a9431e3ae5a5e/tivugupuvon.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/91211880575.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/firenudigomabidasasam.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/845e48e8478452b4a7678adf15cbc0b5/worulidigewomupipogibik.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/kifinoteg.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/xinawezunulavatapo.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/79843563869.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/as817576nta1hke6ccukp2bpbg/pugezosedanik.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/59701275491.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/40723721848.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210902055939_b87wio.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/sipukosexutuzajazitamumex.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/pisanebatipe.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/uiuqovldca593ni28cb48lllp7/56659335210.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/tiboku.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613298a56d017---dafuvalagila.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/pojalusege.pdfIn PDF document text
    • 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_off0000dc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 18572 bytes
SHA-256: 4446991265f8c76c87c69b5f7644ebf0d5271c9653e88334d2e041cf29146993
font_01_sfnt_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 11272 bytes
SHA-256: a47be4a0e6e1fc5da171527c0e6b9dc4f41b4e08e569d88f5e951c5ece126a8c
font_02_sfnt_off000126d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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