Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3551f6a8e7fa4be…

MALICIOUS

PDF

109.7 KB Created: 2021-06-20 12:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c639d07d24ca97bddd486acafefc6d93 SHA-1: 0f38e2f2d8d7b4a4219d788ea6ab4c783b5086b5 SHA-256: e3551f6a8e7fa4be3794897b1c1590542644523bb45d463f772c598d0e7f868a
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=doraemon+movie+nobita+and+dinosaur+yoddha PDF link annotation
    • http://jhferry.com/data/fckeditor/file/%5C/kenolibetanixapapadiramud.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/90408649165.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/67601466124.pdfIn PDF document text
    • http://51www.org/uploadfile/file/a85daf78e62b0635284c52418eff9b74.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29147cc8e9---duzinenorajosisumilixaxa.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/e09lo2hjkbug02u1ha73l6in6b/torapenasagawajoguxubivi.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/sivikuruguwonidijamurilu.pdfIn PDF document text
    • http://kfbi.ru/content/file/rozixowum.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3plv4e1qvgohk8kmln17900vb5/81322174716.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/97a0008d3f10d1eb637fb46489da2c9e/bomavuvirumatewarewab.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/77235758303.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/97b6b0998797b6d3b0cf17965733fef7/momodujakemanelinufujen.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/faxuwerawogutezerinulaju.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/63e2e0cf0a06a298e7feec562a823707/sovozaviririni.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cc8029b29abdd1776bcdb139a5ee0b6b/60702714423.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/61236926475.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941669cb9b7---83759596509.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FE 14316 bytes
SHA-256: b2db7c7ab822716f4088965a3fb73fd8339826e4ab7ee8d1f1f7c881890bf4c3
font_01_sfnt_off00015283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15283 5332 bytes
SHA-256: 86207dc80e7218f3a8832cf1fe950eca63b541836a9b1d3f80755a40a089032f
font_02_sfnt_off0001647a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1647A 1596 bytes
SHA-256: 874ea3af90a6b255128041a785ddd8360334f326da39d3d3f97637a026ac6b2f
font_03_sfnt_off00016c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C9D 12084 bytes
SHA-256: 95186ae928ba84bb0aacab5dd4828c523ea81033a95c0babfd4ca6f05f0fb0b4
font_04_sfnt_off000194d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194D4 5480 bytes
SHA-256: 1dfff53cee25898c7c9436edcf94ce3b8cfb06614bd4adaea11c5f5797d50399

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