Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56b2c7ccc0d8e82…

MALICIOUS

PDF

80.8 KB Created: 2021-07-06 17:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f2934862ec261fd1a7aa55abbf55d24c SHA-1: f619f38502c32f6238a9e62eb2bef2e0c0e692ee SHA-256: f56b2c7ccc0d8e827cf93f79810e5cc0f46b5e15994554bc3e414d7a5cc2df8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The PDF is also identified as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://mbcasc.net/imgs/file/winafudulexatal.pdf In PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d90c7a3b6---1329525775.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/93718671040.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/devaga.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892d02d7f86---20837994064.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/sulotorebiterezufoso.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070e1a6108b7---76809225750.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430071922328619.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/bokapusumexov.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/kidupa.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbad0d6097---75484171606.pdfIn PDF document text
    • https://seerupit.dk/assens/file/76447005782.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/boludotanigemedik.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/3fc9da92615d42c596ef260ec9082e75/revoxasagusuw.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/68043717168.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/89e0f241662808b48e6acfe53f6701e9/98628154131.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e027353e4---87909851345.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501225146278518.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/32263115156.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2105241749236360562lvgup.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09901c978---9174697993.pdfIn PDF document text
    • http://ymmicro.com/files/files/22389528344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mp3+embed+code+generatorPDF 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_off0000d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 16816 bytes
SHA-256: 741254fe4028c3472e13d9188da1b047e37426f3a28776d66846480292bf175c
font_02_sfnt_off00011d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 10856 bytes
SHA-256: 7b15771b40f633ff6487320b52e9a512030777d8e5f85bafd7c07908f3e8565f

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