Malicious PDF — malware analysis report

Static analysis result for SHA-256 929206da6f309fbd…

MALICIOUS

PDF

80.1 KB Created: 2021-07-28 06:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92eca74c59b759ae34e0e53eac2f9406 SHA-1: 89a66166d444bc76f37aa3fde15811ac57fe8b7e SHA-256: 929206da6f309fbdc85641c335bff9bd124e73f89f0f7854a1388cc0b75695bc
96 Risk Score

Malware Insights

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

The PDF was flagged by an ML classifier as malicious and contains numerous links to external websites. Several heuristics indicate that these links are part of a link farm, with some hosted on compromised CMS uploads and others on disposable domains. The document's structure and content suggest it is designed to lure users into clicking these links, potentially for SEO spam or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://yoron.net/up/files/dobotezap.pdf In PDF document text
    • http://karpatskiles.ru/store/file/manedoludimafozadozozaz.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/529f2593a989a7295fa356df5521bb72/2544353226.pdfIn PDF document text
    • http://glttek.com/userfiles/file/96580988366.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/debafagojijojabe.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/misuvolatudizopavelegodoj.pdfIn PDF document text
    • http://aimic.com/userfiles/file/jesixagewaletesajeduniba.pdfIn PDF document text
    • http://iphysiology.ru/upload/gedoz.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93dadd7e3---tabes.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/44873454225.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/xobomubuwibukamud.pdfIn PDF document text
    • http://zuche0551.com/upload/file/togokupukopovolonuliwoxew.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a1194a836895c3365eee090f574c243d/rakemuvapofabokanemaz.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/kolujagevusunikiriwawodok.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee67c051e1---zativiji.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b2d4b6f9c30770f02ece11f5e43291a9/pitosaxekeves.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/42779324095.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/45255882401.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077699b7e2c2---jumufonagomipukatex.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e00ff613c3b---lataku.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087004ad1ad7---341565122.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/069a2322833651dabf6fd6c8ac09cc5f/lamuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+pool+table+regulation+sizePDF 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_off0000d450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD450 16780 bytes
SHA-256: 88381115ad68a77198a10633a538e19b03f558a02771194692acbf72fb4297b0
font_01_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 10824 bytes
SHA-256: e0660892b7288978e043b8ce3dfc50d2829de691b8184bad0dccd29b7f6fb96f
font_02_sfnt_off000118c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1