Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb1f2f4467adae4…

MALICIOUS

PDF

73.2 KB Created: 2021-09-19 08:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6514563abeeaa847267f60d5d5f0c7f7 SHA-1: 73739ba7346849c624e75b3702c0ff6adc441f6b SHA-256: bdb1f2f4467adae4ab7b07921880178955aa0bcd3993d772bfdb75ea420c2b1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress sites, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a tactic of luring users to download potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://roshnaai.com/ckfinder/userfiles/files/kogobimunana.pdf In PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/18896798616.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/55514641874.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/golutidujomixuxuredujaxiv.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/pezonilupomewekax.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/95527775073.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/66342101843.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/xadoliror.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161434f2d66f6e---monedewinanuj.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/78382085705.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614488532995e---vutemezusi.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/bimabotemobazitanidag.pdfIn PDF document text
    • http://indexone.ru/upload/file/bufusutumidenoxafar.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/82009753924.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/77010215315.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/27201847168.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5bfa4e17d---silaguvotobijezapuzazakup.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/l8o22m9g7l4vpkvpnie41vqm4r/murofexopugukaniwiju.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/zijenope.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/76315854506.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/8336721565.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/75546568857.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/69789545605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+game+granny+3PDF 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_off0000bcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFD 10604 bytes
SHA-256: e6216417a05687bf4f3b5a7a36fbe6aba56cfac46663c678256cfd84c6a28fb8
font_01_sfnt_off0000d50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50E 16456 bytes
SHA-256: d02ffc564ef09314c32622d2effdc9e8e7e98223abbdef3f09f27d0036f13635
font_02_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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