Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5fdf1ee6f8b980…

MALICIOUS

PDF

87.2 KB Created: 2021-07-08 19:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cb218d2f164944222f45a1516132a66 SHA-1: 067c53999db162c989c3fcb9364aa19f443b2a88 SHA-256: db5fdf1ee6f8b980dddf7172cebe6ffce67d8dcebd8e55972523c85049d56b24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pelicanfinancialnetwork.com/ckfinder/userfiles/files/kegamenuvuxevimeweseneze.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f928ab8fd8---ferutimutew.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d6e89e9eb---87357149101.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de3206bcd1f---xajemuwabumod.pdf
    • https://bestrecycledautoparts.net/images_i/file/50036897814.pdf
    • http://massimobertoarchitetto.com/userfiles/files/72212190415.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/5a21f2b67571f4b2451942edcd1784da/93159578546.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee2d823cc7---36460445454.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b65cb3ee2---5977017544.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ki0n3m785se3vlpbf9spruvrij/37519322519.pdf
    • http://matsonconstruction.net/userfiles/file/78867825060.pdf
    • https://tecnicadovolante.com/images/file/zadokupemide.pdf
    • https://buka.ru/sadm_files/somogakixerig.pdf
    • https://muratay.nl/userfiles/file/30569422115.pdf
    • http://motorlustor.net/userfiles/file/32235397853.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/fa78f0b54a3bb8dac81927b029d3046d/21119444251.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/12497838493.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210526032732860685txc6za.pdf
    • https://aksusu.com/upload/files/butenexovife.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/padolilefakov.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607e93ec8fbb8---49042055588.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/29nsalkv2luri9ufmufhambjpg/dajavedelawanado.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f73369e538---gisurufupulilopebikuwapir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+human+body+if8754+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe4.bin
f11cdfa640cae903fb0acd903b88b2ef8cfec27c0088ac71bcdacd3595794b71
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 17848 bytes
font_01_sfnt_off00011def.bin
77a6af89552c06ff3892baff73687ac4d638c7dca9dc19d75ab4a9a9f192c9e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 11348 bytes
font_02_sfnt_off000138a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138A4 16792 bytes