Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2839e64c33469de…

MALICIOUS

PDF

119.2 KB Created: 2021-06-26 04:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 59c638127b5a5f9973bb9eb3c6e58a75 SHA-1: 23d682c14f76738a3aab5f6bc9382cedcdf7cc54 SHA-256: a2839e64c33469de424f1942f1c4bd4b530866bee1e84589926f57153bfa0a7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic findings point to a malicious PDF leveraging external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=good+and+bad+conscious PDF link annotation
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4373cd1745---tokumoxadenurujuzadagexuf.pdfIn PDF document text
    • http://skncn.com/u/files/65229675136.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/98618685011.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e884a5e50a---38730404037.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d7033fcac5a536b05dfe6237932a9443/18442580302.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/704da9cb51183b15850ed1abc1082105/niluxezipiworirinagofuva.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4980f1aeccfd144db090f3a85b9bcc6f/57842920110.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa394b0b0b---93023500303.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/qevrofsdib3am2eohnksbujaul/wejudume.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c293310eaee---63688369736.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/sejezonatuzipitijejir.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160789f21ef097---pedisusufebuzaluwunadarod.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c3c7e61ae---nasuwezemijig.pdfIn PDF document text
    • http://teplospectr.ru/images/files/61292860977.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/vakepi.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/vowupipokitapugubeviwikig.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751cb52fefc---40871596616.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/fc110e668f194b22950630210b4c3ce4/50839978210.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e184fe7acc29a789c9b99b0ba7a49e51/lofutoduforuze.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a01c3bc8c---xegitudadosuwofelopeg.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a37fd89d7e---jokomopikiw.pdfIn PDF document text
    • http://markone-tools.com/upload/files/donogamarefunulipazimop.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_off00017187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17187 10268 bytes
SHA-256: 8bf0555c0068a51b295fc47316773ca64ffe2337c6debd7a5abd7484e60ae506
font_01_sfnt_off000188b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188B1 17784 bytes
SHA-256: 65013efd3d8c9354da33c9d388c7472908d105be9178865bbe822fe9aca9d0c1
font_02_sfnt_off0001b648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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