Malicious PDF — malware analysis report

Static analysis result for SHA-256 61360fe7299e0cb4…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 05:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09324de551f7297eaa773f93829049cd SHA-1: 01fb83e254547175a755516bb324964f93e059c7 SHA-256: 61360fe7299e0cb4b93ca1e587ed578d915e27b090a8daa1a6e99e8d16687826
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to disposable hosting and compromised CMS upload directories, suggesting an attempt to obscure the final destination and evade detection. The primary purpose appears to be redirecting users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://myphamlulanjina.com/upload/files/97560024896.pdf In PDF document text
    • http://sarlampa.ru/upload_picture/bidomon.pdfIn PDF document text
    • https://ebooksweb.net/files/file/41361797770.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/lexizuzitawowodoloro.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/navitemamokidusike.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pediba.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b9d835e9e---18789625602.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1ff01ad127030d521db1127a2853ac28/tixoxesokagewekosur.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/98780746186.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a5ad08fdf22be24e9594be46f14eb7cf/fodexi.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/hq5hviuhi1vc363pmmp4t7g9k5/gitiwesutulugejig.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d5f83cf3b4d4994e2a3483a8f0577077/44935849001.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/nomefudefevogasexuwudax.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/86938306343.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f120e2d6---welugobewiruwabineraze.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/puzigasexonogevobu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160943045783ca---54703339876.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/fujofenijelogiwufov.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/66546259410.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c48055859b---duripesusafiw.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbc512390---kuxezapirurip.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/sosoto.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b14954f608---wusubevirewagekitej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=malaysia+company+law+book+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_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 17752 bytes
SHA-256: 47453711c7973881938d080681be8c72c381b9a2016aa5a5855cd64e4a045113
font_01_sfnt_off00010e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E03 10876 bytes
SHA-256: c0aa49abe47dc8b966d0833fa57ad609a1b49477e0cb4bab956cdb04c3b58cd0
font_02_sfnt_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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