Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d896518822d78b4…

MALICIOUS

PDF

109.4 KB Created: 2021-06-26 14:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 35ff60643bcc82eb5cef08165e017b7b SHA-1: 32f4110661cbfee19a5f562a764b13935cb802b1 SHA-256: 1d896518822d78b4c14efc84bb7cbc5b7fe66812c12a813c2c2d59a90f9d47d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary function is to host and distribute links. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=first+signs+of+bronchitis PDF link annotation
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/mapenusavokakenujatimadot.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/60680221633.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/49289214737.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b6b08487---92967778220.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b512db331a1---tilekugopu.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/2502fa7b505c28e31cd02536fa66b165/romomirexapolivemo.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/42070315845.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/lirakaxa.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/bevakanuzu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/7ed2c0869495c8fdfc95d7bc3628c589/77490844990.pdfIn PDF document text
    • https://arerp.kr/data/file///tefamodajoda.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/d14d6bf51576f49f2d7ab0d8ecdde615/46388824866.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/84752954568.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/kavekobajakisudebati.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5229e2fd84---90716255301.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/80499431408.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a81e395e98c---ruzipinisot.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b12c83768---99652015925.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/wutodojiva.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/k2li8oquf921hj2f5b22qrp5dn/83957247105.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/nuvavolikunaw.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2c0800bc976c1aec16f77f0f42936f88/kolutinakidexibonuwezipod.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074a08b6c051---4116255321.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/bitumorezukefig.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_off00014961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14961 10392 bytes
SHA-256: 89884d5dfe140efe7b465b7829ddb5fbcfb696fa295e047c7da1075e6ecbd0a3
font_01_sfnt_off000160c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C8 18148 bytes
SHA-256: 119c04b99195959ff85486930877ac5eaa6c7b0a7536d49d67b7812cdd681654
font_02_sfnt_off0001905f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1905F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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