Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3b3ec5ec2b5af4…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 10:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51b60d986dd3d2b7db0ae7654cc0907e SHA-1: 8031ea6bae10f1a7a7a5afaa82473ec50c7e793f SHA-256: fb3b3ec5ec2b5af41c408abfeae9f89b9e32bae53811d9cfbd63a1365a2ff3a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it's designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://wastran.ru/uplcv?utm_term=greed+in+the+world
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/40c979f919d07079f33dbe0671b79a82/zirowemarik.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e46569c255d2484c4010485d9bce81ef/62999381425.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/5132c2edd4c3a293ede2df87faa0ae8b/97627033665.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/14882321809.pdf
    • https://catbasailing.com/upload/fck/file/10881318196.pdf
    • https://tycoonmarine.com/userfiles/files/pixasigupegekixovosoto.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160743c4845efd---papik.pdf
    • http://timavoshipsupply.it/userfiles/file/70641459271.pdf
    • http://alarcon-v.com/editor_upload_image/file/82980100435.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c599b04f---mowuguxukadexajelakekori.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3ae3eb227---63485433330.pdf
    • http://ranaghatpchsschool.org/userfiles/file/27089448294.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf875577eb8---11361541347.pdf
    • https://vieclamkinhdoanh247.com/upload/files/mopoza.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/sh16o1m72hv51gb1ojd1f464i1/pelafizitiradexodef.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d635b085e9---tofejepamarozajija.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e971464303---96182691917.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/lrohgjcn5g74a4dsbqi0m0racp/3343007605.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/bb9dfe5c12191b298c1b6662b3ed3a22/55780088958.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a5064d41c91316a2b0afe2a9fd433209/3646469460.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1bc6410f4---4455379699.pdf
    • 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_off0000f192.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 16792 bytes
font_01_sfnt_off000109a9.bin
9c03e05234e47b13cabf437a5e5531cffd895f379e8d8a1b5614e0c218eb437b
pdf-font-stream PDF embedded font (sfnt) at offset 0x109A9 10140 bytes
font_02_sfnt_off0001203c.bin
9fe1e01fcd507d83074424913389698ffba94009fd35f171909a700ae3bd8198
pdf-font-stream PDF embedded font (sfnt) at offset 0x1203C 18604 bytes