Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11e8af556daad29…

MALICIOUS

PDF

99.5 KB Created: 2021-08-21 03:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 5c37026b12180bb22a87b112b81c96ad SHA-1: 528df04c49363808fc80f98651241db587f66468 SHA-256: b11e8af556daad29ec7c85b0225407c295a5c5af382994a6c2b970c54432e0a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9987

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 http://icloudcleaners.com/uploads/account/autoresponderfiles/niguzi.pdf In PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/dokutovivago.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e2460335e07bd84b1a3c38f8eee41283/figutitarug.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/movemokexifanefufufifaxe.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/vq26jnrbj4dhfd2pne3d13ltii/69386461903.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/tujer.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/zuvefamigazoxiwibudele.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/12379999817.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/44633706451.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/dadaker.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/j5n7ik2vj6822j70eshi1dejd7/48268930532.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/94206748836.pdfIn PDF document text
    • https://botroul.be/uploads/tidozakub.pdfIn PDF document text
    • http://hainfelderteich.at/17829794929.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/nutelopimides.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/15256658494.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/90gear0idebmdsuv0o1gtfinop/89864172286.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/11510936539.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/e7c0cd2a4392c5d786b92691d6b1dea9/tivarigusof.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1efc0e3c339b4f3e636c058749202181/pogirex.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/8cd7d3ae09c00ec33dc2eadb898e8d6a/denuvujurefutiduv.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/dc4ok92sfk4c693qjv2cm06ppt/bilonipinome.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/bf91adbf7787e3607e01d317bfb1a513/82200971207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=david+bowie+song+never+met+a+girl+like+you+beforePDF 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_off0001206c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206C 11296 bytes
SHA-256: e0c7ce5bf24728f553a811a81eaa4b6c47105365e213d95a4fe6f6520a5545c6
font_01_sfnt_off00013ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD5 17496 bytes
SHA-256: f037b60ea2804d872c3d2e6f6771289f84c1b3d7c4158dba05271ef186498dd6
font_02_sfnt_off000167ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1