Malicious PDF — malware analysis report

Static analysis result for SHA-256 561cbabbbf88cfe2…

MALICIOUS

PDF

74.0 KB Created: 2021-09-16 12:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e310aad699a08c9086cd5838452ba50 SHA-1: 4f329775b46117b993df1597365f83d4747daaab SHA-256: 561cbabbbf88cfe23c9c6bc42b74c985f200e891cc7301dc9dd6bd30305a150a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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://queure.ru/uplcv?utm_term=watch+charlie%27s+angels+2019+putlocker PDF link annotation
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/xifelofopizaje.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/sakaxed.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/65112749669.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/37884444197.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/rupinidavejev.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/xopevujimut.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/mabevera.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/vopinojefafojajexopu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16142acc5acda4---93624270594.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/loluveneb.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/fovosuv.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/kilejulixofasuburawamup.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161405a081d210---pupelitanuv.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/fuvuwisifurumirofazudoli.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/96771579543.pdfIn PDF document text
    • http://emannsltd.com/userfiles/7211191461.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/xotonujorigu.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/tadomaxe.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90db6b3d6---5448180176.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/xelifuvosu.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a85cb199---48489708736.pdfIn PDF document text
    • http://rapet.hu/files/852110896.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/44486049562.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/badijamasenaxakaza.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_off0000b89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89B 11332 bytes
SHA-256: acd7dd3a028466c4d1d1cd591f689af67822e5fe29acf4c78aaca1b375325d84
font_01_sfnt_off0000d365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD365 18032 bytes
SHA-256: b7e6e8638aef2254945c04f0068809c659616cebe6db8deafd7e08f92c23a3f6
font_02_sfnt_off00010268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1