Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd83caf3ebd7288f…

MALICIOUS

PDF

90.4 KB Created: 2021-09-01 02:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f261e62e27f5fed4152ff91710e37bdf SHA-1: a700a8cd054f014a11c00c1bc74ac4b7d49f7093 SHA-256: dd83caf3ebd7288f2d937710cb2af9b4467572907f3d9d6c240fa22cae70f320
196 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 0.9954

Heuristics 7

  • 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 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.
  • 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://oniceh.ru/uplcv?utm_term=what+is+9+plus+10 PDF link annotation
    • http://elitvorota.ru/f/file/kirusixinuwem.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tl5htnjuukc29fe8gcoturpl5r/koxotezer.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adbf66eb8c---xunifimipefa.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/3964868042.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/dawewunutuw.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/21k4q6ddj08ntieoecje91pa73/26874722481.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/65027257028.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/7c5db099eaabe2a3ea1259749da4c796/zarajugumegasutafabuwosiw.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160799613661ad---62080544808.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/54302073160.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210816_1C86DC573FBC6BA6.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/d60fgm1euikabd2va0gidnnpc7/71490436559.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/62815370068.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/746bdfc31495a8dcde86fb05729e0b5f/gusekunavidonos.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/pepenuvejuwa.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/dutofiriwas.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/jalapojisiwaxatalozun.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/de62e57c208deeffa7b6b7f24fa4a0af/zamebeporunubokideko.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/12820357580.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/nego55j14pillvi8jerh5mtt5c/kizivurulusubajuvazan.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/72410890016.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/796a1188032ca8cd3f1dad8a182aff5f/padepanasiwapomireraru.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/safuzisiwivox.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/40325140fdfb1e05d6a80d01bbb183e1/xefuzusakefelukafuda.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9ffb8be79ed53b00d4d1ed979da28369/81320248043.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cd4655744---74872349809.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_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 21040 bytes
SHA-256: fcc69291e4a26249acffe9f8e7094cc722d93c1a881766682c9d92e00a9c0e43
font_02_sfnt_off00014511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14511 10328 bytes
SHA-256: 02415c5e0b7d1b25b3f0a30de06050ae81fd3b12eec4d469fb369f14cbf9b2d8

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