Malicious PDF — malware analysis report

Static analysis result for SHA-256 e565105f4eaaf093…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 22:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30535c827597987005165d8d9e5bdeb5 SHA-1: 9d19e71b448a6f66d880281acfc500fdf72d685e SHA-256: e565105f4eaaf09349b64e4d940b1176027c14c902e94bc5854a5acf77afc13a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and presents a link farm with multiple URLs pointing to disposable hosting, suggesting an attempt to redirect users to download further malicious content. The presence of embedded JavaScript indicates potential for malicious code execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=don+bradman+cricket+17+download+for+android PDF link annotation
    • https://tenekedjieva.com/uploads/file/zodimigil.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137c21916dfe---newufomuxidovozeza.pdfIn PDF document text
    • http://anm-av.de/uploads/files/tutizuwodupasutuvibek.pdfIn PDF document text
    • http://adice-area.com/pictures/files/rufonaxoxebowoni.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4cef12d04---vulukizokiwatoj.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/20098839420.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161356a27e0dd5---fotidilujoxerodojen.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/ramuxapajaparumexubamumi.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/16933854369.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/94024514984.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/39tc8jsd09irapiri9meop4hqf/71781634872.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/wefizagusujug.pdfIn PDF document text
    • https://defi128.com/userfiles/files/21782016013.pdfIn PDF document text
    • https://svltv.in/userfiles/files/jinesuninupajodipuxitiso.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/72923976997.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/wanagoxipa.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/95252338979.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/27796747089.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/53184281623.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/betot.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/zikefosipotepubob.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/98682072198.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_off0000d595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD595 10892 bytes
SHA-256: 9667ea1d2da430e7de4fb898e8072a74371a7b43f434dcccb1a07fed0e486fff
font_01_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 18084 bytes
SHA-256: d0360b000a066e735f7cdc5fdbeb90ec83ba3d0eaf46fe66db659c8db4e79593
font_02_sfnt_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1