Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c18ba14cbf81597…

MALICIOUS

PDF

74.6 KB Created: 2021-08-07 00:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dc16ac43022699c0b8c7a480ebdd12e9 SHA-1: 2536a058899f7d8cd5a1d416c9b2371ebafbb2d7 SHA-256: 6c18ba14cbf81597bfa6ad89fb7a41fdb13dd69197ccdbc395da64001b526f11
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external files, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and numerous external links point towards a phishing campaign aiming to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad67094b0e---kumapomu.pdf In PDF document text
    • https://implant-drill.com/userfiles/file/75976421486.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/14097887758.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160994ceb78c5a---76673156147.pdfIn PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/20649420084.pdfIn PDF document text
    • https://loctra.net/userfiles/file/98072811801.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0090793ce8---dugudeb.pdfIn PDF document text
    • https://blokhol.com/upload/files/zujanupiraxuwilut.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/32646228228.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7f0b8d8eb---dorimosamiwalob.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/4078669909.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd87c5cd158---xuwetuvoretawegageku.pdfPDF link annotation
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f61c3d1a384---40547811830.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607019c678497---45254719400.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb62353944---48880699361.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108444d8f397---1441429556.pdfIn PDF document text
    • http://robbes.nl/media/files/kizokam.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/54feb12efc1f583b72cc0c0cc1cf643c/gaselisedi.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/e2467b647bbba7134ea478ec19252516/sugobewamun.pdfIn PDF document text
    • http://vtaky.sk/media/file/58812337523.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/pugofidibisesifum.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/163675506701620575349.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88f92723e3---31888715291.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920d7296036---89969883906.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/94945555806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=brain+games+for+android+free+download+apkPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/09fc8c227b02dc99d04216adbe8ac306/40409325231.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_off0000c143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC143 15832 bytes
SHA-256: 36e07bda36fac6f567176ce379f1ba1b801c0305ae1f4258f53477602bae30db
font_01_sfnt_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 10976 bytes
SHA-256: 409f83b55700b09f0f9c99cd7e7540d164c82d65f17ae525b516184465a583bf

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