Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcae491c3942a9dd…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 18:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d4668bcbcfb260f599eb0e39c7e8735 SHA-1: dcdaaa7472a8d9d11987862a6f394d2277bf4e36 SHA-256: bcae491c3942a9dd7a758cbf0554f406e10223d054a742c0bf8881fd9e77e53f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bbpcosmetics.com/admin/upFiles/2021-9/file/84112307546.pdf In PDF document text
    • https://pbpkrosno.com/fckfile/kisakawizusigunuv.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/vimudobudipebov.pdfIn PDF document text
    • https://orrizon.ru/images/file/34282723487.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/lebevajaker.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/feef380c6ee353dfe5d93c83fa7d878e/zugotoxolukaga.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/84327042474.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/87276342592.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/tosetu.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ei3rn3hcqk7t45mk8n5k0e0rqe/rejawemaverutebab.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/lolitazukuxa.pdfIn PDF document text
    • https://hoongnau.com/upload/files/xonadivufa.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/76e3f5cdf56b5988d47ad3d0bbe84b79/mojajotezotut.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/nuperujagube.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/82382259577.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/65096375776.pdfIn PDF document text
    • http://totoumi.jp/upload/file/77972040138.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/luxifelefabikorub.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/susibuguvorokavo.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/15039211218.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/56586718487.pdfIn PDF document text
    • https://badrivishal.com/media/bikepemofidelokodiwim.pdfIn PDF document text
    • http://capableapp.com/uploads/files/30876557695.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9fc95e0a1---5219585085.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/popumimuwavevijiker.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=google+ads+androidPDF 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_off0000d030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD030 10364 bytes
SHA-256: 5c38bca6dc819519b15b56cd98655f4a109dd5cf025bebecdf999a76d88d95b5
font_01_sfnt_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 18200 bytes
SHA-256: f4888b35bcddf584ff0d56ec2d930d7f276cd7f3703540caaa2efbdac0a6e2e5

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