Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cc3d0941b32493…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 17:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ee60c84ce858abf8ea569cad5034d34 SHA-1: 062b78aefcdd67e540aac776bc7634a0c7e6456c SHA-256: 99cc3d0941b324938b63a83f2ecc7ee2aa3be06327fc5dc5ae869779edecd91e
192 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and multiple external URIs, some pointing to compromised WordPress sites and others to raw IP addresses, suggesting an attempt to host and deliver a secondary payload. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=gate+2018+instrumentation+question+paper+with+solution+pdf PDF link annotation
    • http://albarossa.jp/js/upload/files/85054185444.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/83521211141.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/73912495844.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/55928932072.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/mobepudoxafapalevavosole.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/soguwezasa.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/27844474519.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/kpt9ffarc3bhqh409rfvdod2bs/rekijuzigalufediwifesa.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/17237460397.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/40389539623.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/41621246265.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861f8d84d39---83885134113.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021081301323580554.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29537901067.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/cc282dea89221d16e311cbfe708e510a/66651671738.pdfIn PDF document text
    • https://promise-land.com/upload/file/3427672875.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/zibekilavoliworugudevekod.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/rigarar.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/98641129522.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/526a707ea221e71ac063db4dd0a11bd3/dujebapulavuvigaze.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/xemamipexaluva.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/03a61844060261410561eef377441d84/kajesosavapuseb.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/lawinedidizulipojowuv.pdfPDF 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_off0000b8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D6 17280 bytes
SHA-256: e5a6dde3a5a7bcc526308579d5c92df7ae1d6f6b95fc9d64e86e9e9b3248f4c9
font_01_sfnt_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 11636 bytes
SHA-256: e97788928dbd1c97536e26bd209d72de667aa64b4c10a2c2f9a9f7a13c1719a7

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