Malicious PDF — malware analysis report

Static analysis result for SHA-256 481e263a80b2e10d…

MALICIOUS

PDF

107.2 KB Created: 2021-08-16 04:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9fdd4e866f7461aa6843f533345534e8 SHA-1: 741485c1da46fbb05b68120d1be16cb6bbb8afdc SHA-256: 481e263a80b2e10d09d71a703360712c7d55c1067737da9a25f265fe178068ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on disposable hosting and compromised CMS uploads suggests an attempt to obscure the final destination and leverage potentially vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16106ec1833083---sinegedesesa.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0d65173cd---68794277971.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b1245342---zegubitinede.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f71154536---xijolibit.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bc67efee83e---fijokiravaduwodibubu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d2e410e62---tatobuvape.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d7f8a40bb---jevonejirepebokivijasume.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a596d023132---fokanivirukijobewat.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/7c90b8cef2ec70dd63af7e7abf90c6ef/ribepezatikade.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/13fsbpehjvt27c25nnjeglqrfk/mizulekobefavep.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/1091217782.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/74484043973.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/zasatil.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/nizovajibavonuvupubogonek.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/af746a64e8d6c848ca88dafbd82814ef/9207620499.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/55743b44b7d3d3e753948fdf0160063a/gofoxulojutopufiril.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/mitapogov.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/6244722489.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/nerulelatifeparifenin.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/96614093680.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/6a93262ba2e881dd0c504e780f0f002c/53637477330.pdfIn PDF document text
    • https://europartner2.pl/uploads/99051223282.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/napudanamoko.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/tuzoguneridevar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=convertir+1+arroba+a+librasPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000137ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BA 21356 bytes
SHA-256: f843db6c2d8e5ba31a2fed3b1d9e34ff65da23bbd7a845d09bd2533493986f59
font_02_sfnt_off00016f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F3C 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_03_sfnt_off000184d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184D9 10388 bytes
SHA-256: c34a88eaaca641db3af8a98d57eb3080a289cded6ee7688f32235c50d743cefa

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