Malicious PDF — malware analysis report

Static analysis result for SHA-256 653e0af3815a645a…

MALICIOUS

PDF

75.9 KB Created: 2021-09-04 05:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 783a409968f665abcd5c060e72b65df7 SHA-1: 8110c8499b761ba42b5eccb04f936f3b377dea80 SHA-256: 653e0af3815a645a7ae2f072de9c3cc70dd3d6d76c9d7a3be51defc356e897b5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://annamsaigonlaw.com/upload/files/suvowexezivukupi.pdf In PDF document text
    • http://epodhajska.eu/UserFiles/File/kowelinapipupa.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f006e9237b---41588315035.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/guneveteberu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609475a2815d5---zilivaluwaguwakudidekejiv.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/kobakidamozubune.pdfIn PDF document text
    • http://jaht.com/userfiles/file/neferedatofu.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fb14d66ea---fiwakikupitopifuwewu.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/fesikuk.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/rijuzusuragubaluj.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/bigunapafirilu.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/18203507304.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/2e55bc24903f014fd6d868f488fa0083/37528212133.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ja0rbqjmc2r08k85nbbsfj5ro2/juralumomolesajegowe.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/27691726538.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/37168417679.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/170776101714647afb23510f3189a644/8845762025.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/f9ad642c519da2dea05b101d07ed9673/soparipaxupiketak.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/71700905991.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/mubiwepedafukiliwuxej.pdfIn PDF document text
    • http://citra.cl/userfiles/file/26506141475.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/93982875558.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/jipakunakizewurixonofig.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/vowadomowiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=telecaster+wiring+diagram+pdfPDF 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_off0000c472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC472 17180 bytes
SHA-256: 5f4f749ef88fbab0c06274f6537809587e817f928d3912ca8f7ea4d29fa8a662
font_01_sfnt_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 10892 bytes
SHA-256: aeb9fa81e874830d5f536bec44ce864d20286e3f191816551b259aa4ab50beb9
font_02_sfnt_off00010a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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