Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef90a4f5c62995d…

MALICIOUS

PDF

94.4 KB Created: 2021-07-14 00:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7272655396158169cd7d61ec0ce86b4b SHA-1: 444ff9c43986154598ba06b5afdc811037137f3c SHA-256: 8ef90a4f5c62995d3aaa4f8f1fb87faeb718b72cb9220a49ce62fc03145e8cde
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://garglob.ru/uplcv?utm_term=how+to+write+a+answer PDF link annotation
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a39406761a3---95528265761.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a6aee36d7---63634627656.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/3c72695230f8e2736a1016a27dc78082/jonizamepijeru.pdfIn PDF document text
    • http://hyundailed.com/upload/editor/file/befizaxowisavomadari.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/1ae148acc06d6c5c8a8aa38e98921cd9/19962575176.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/59358916840.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/foboxizofibabadolana.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/botedizimezigejoge.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/pawerewipenew.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/35719819894.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e710a107410d3e00942547bfdd5a8597/61884334304.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df78fb0d45---9213651092.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f4cb300d9---riperubekamewudadino.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/sisokelipikabexetofa.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/basekevulaja.pdfIn PDF document text
    • http://getem.plfiles/file/12210542683.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/p4shrblkdocvbs4fod1hb2qe7g/70378694236.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078b715270f3---98107690375.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d8299eef87b1bcf1eb379852278eb0b0/42107958072.pdfIn PDF document text
    • https://ckmandarin.com/uploads/bidulosudixele.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/29959799150.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/vaxekovurixagarujegatitev.pdfIn PDF document text
    • https://ahha.az/userfiles/file/31455450269.pdfIn PDF document text
    • https://777mto.com/contents//files/runivugenakugekugabizivad.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_off00010e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 18000 bytes
SHA-256: afcbc7a323859b99b2b378cada23bd6cfed93822aa75afe5f6c7417967903784
font_01_sfnt_off00013da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155BF 10132 bytes
SHA-256: 5773881e2f3fef6abc21e0588a3c036247445e09dbcd6b70fbfe70c9dc4c959a

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