Malicious PDF — malware analysis report

Static analysis result for SHA-256 06cfbe51b35efcb4…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 02:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae06749ff9f5ac887a4dec01c67bcf77 SHA-1: ea4f69b5ac8c747c95f35d131c9ed890a03dbe23 SHA-256: 06cfbe51b35efcb4b663ce2075c2f1e11915ae0c6913a509108f716c0f72425e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating phishing and trojan behavior. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload storage and disposable hosting. The primary function appears to be directing users to potentially malicious external sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://langeline.com/ckeditor/upload/files/xajovivosugiwunim.pdf In PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d86958319b---pajetelaxisonusilepo.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/va3lepduurosekot1ese4g3t45/67372992406.pdfIn PDF document text
    • http://www.heksan.com.pl/file/6924427642.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/56876775909.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/45270269461.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/19463233571.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/64032778738.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613714c532bd4---teduzazulawib.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/zanufopugow.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/maqmbrksdgk77k228d8egbnbcj/soxozi.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/36583506268.pdfIn PDF document text
    • http://nscenter.cn/upload/files/makinatosu.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/72877484312.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/vigobenexerigiramix.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/20399705565.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/raxozutujub.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/77816329283.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/18691321906.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d05a88a43---96152726840.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/xeraxe.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/24218179940.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/88181565149.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/lutilevemibusifis.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/64009449384.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/fiwokado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=eye+of+horus+demoPDF 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_off0000c1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B7 16428 bytes
SHA-256: c23d467951092c052dc19eb0ab234dc4e2fb2e8a305c051b2897b8d0935fdbe8
font_02_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 10312 bytes
SHA-256: 3dae468b811c69f42e61aea2c2e97e0c2e858fc6a995dad74799a7f8e1a70d19

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