Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3fd1142f3c87ae…

MALICIOUS

PDF

79.8 KB Created: 2021-06-28 17:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1e91f8426466c2465531d27164524ca9 SHA-1: 4710fdf8d5d3a888aa3c1d14d4c301e0e83816e4 SHA-256: 6e3fd1142f3c87aef3d547ae8c35dc6be672b4d47ef0e37d0ed95ff7cea52945
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites that host other PDF files. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an effort to leverage SEO for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=poultry+feeding+systems+pdf PDF link annotation
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b2039d223---xugizunifadeg.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/09d3fb16c7b8d1d8e06367db3c40be98/nixegenumid.pdfIn PDF document text
    • http://vejwun.cz/images/46705361155.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d9a923ba934546150a3189d65bb5f99a/zolepopelew.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/oebjmmr4p36s6b4abe3ctdikq3/24888870533.pdfIn PDF document text
    • http://xn--80an2aej.xn--p1ai/up/file/85148357913.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/og04k0g4s68lqgl5sck9ffgbpq/39453221609.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c791484a80---35113897261.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/5e02e07867aef13dc66933a5fcd521ce/pedugadawisula.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/99651172207.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fcdca81fd---5149334652.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/41089817816.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2d959953e---kutudok.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/61635245734.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f48f4473b9---99964322308.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c87bcef1872---44467497715.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607878771c1f2---90636038243.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/49024655785.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607875532529f---gebet.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c963f9beb930d84bf31520ef3b8a1867/21088544157.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/32020225506.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60BFD20FA2A18.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/d651b385e69beb3e9ffb2fe0eee0e699/57400506734.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_off0000d404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 10896 bytes
SHA-256: 750f6fd5105d3e65306fa09beed5c66bd261cd0446ec55aff683ca8a6c899879
font_02_sfnt_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 17424 bytes
SHA-256: 60adff3b516144f407dc2b63e93b2f4eada809f7db07209e32b216fb1b158862

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