Malicious PDF — malware analysis report

Static analysis result for SHA-256 59cc2ebe38d3aa24…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 20:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 196cc9b8b40b3b33becb52c37786f6d6 SHA-1: 384cc58580503498d63dd7c72b1690197e1de0cb SHA-256: 59cc2ebe38d3aa24c5010ec2b15993b40d78b684e5688748be330c920c8f89f8
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which are hosted on compromised WordPress sites or disposable domains. These links likely serve as a lure to download further malicious content or phish for user credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://medvor.ru/uplcv?utm_term=private+mode+on+android PDF link annotation
    • http://fittbikese.hu/files/file/zopiradademezexunokufigov.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/gm45s1f1op3nh0a7fmncaoqjd7/baxenewiv.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/dafewopekipisa.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/68992752248.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/mimedatowivexuket.pdfIn PDF document text
    • http://kelvista.lt/images/files/28084519579.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/85093941435.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/lusepadopujelo.pdfIn PDF document text
    • http://jucal.es/images/file/93830522901.pdfIn PDF document text
    • https://vleek.com/uploads/files/29875064197.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140192179d2b---26246989056.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/62498542069.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/dulub.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e616537491---nemokunep.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/32093730269.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/tomerigev.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/pawoduvuw.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/ralarobalufixozo.pdfIn PDF document text
    • https://dafelia.com/files/kufafefove.pdfIn PDF document text
    • http://wdnederland.nl/file/20061656745.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1ac157039---jujekerikomogapomajajelub.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/4524852747.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/fopubepozezin.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/34379337355.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/19664381304.pdfIn 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://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_off0000d3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 18396 bytes
SHA-256: 051d091542ef01b26007626aace9b76bacd4c51ac1f86dbf208ed004112f304c
font_02_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 10260 bytes
SHA-256: 60c877ba11896eabdf81716e60efecffd6f2ac43c208e92c24c3d56483e949b0

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