Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc9941f18435891…

MALICIOUS

PDF

78.6 KB Created: 2021-09-27 05:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53bf8828d84232a3f40a441c8b258503 SHA-1: d8bc2bc67c84152e51001dd429f632df34233ebd SHA-256: adc9941f1843589145a2a1b71e7b13f659c0aa4d951c0005c5701f4c4333549d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and links to compromised CMS upload storage, suggesting it is designed to redirect users to malicious sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=all+screen+video+cast+apk PDF link annotation
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0929955d---91442510765.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/larazirulovalev.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/20963617227.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/74514138904.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc6bad7924---38858531483.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/ronixaziwejojub.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/90641079324.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161433c3d88a7d---moburumetem.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/fagekaso.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/79078841927.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0301e2f26f382fa88079aa6af78316a1/81193708725.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161492db7ee51a---kaburoxixele.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/93080223497.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/8240573530.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/83001308809.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/latukagajopekotomajavofeb.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/doxasodigavatawusawejo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/53166647398.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2987f38ec---85495860474.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/24571845565.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/xidazom.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rapoxojonafumanupunajorav.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/71390440266.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/33163073447.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_off0000c4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D8 10644 bytes
SHA-256: 66dc41ac4bc290eaab284edb8aecd4267efa94c8fe08582960aba23317986bd1
font_01_sfnt_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 21280 bytes
SHA-256: f21eceeb37b1343ed85e15f05223eb2a7f19aaa39146218a75e694a4702a5e13
font_02_sfnt_off00011527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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