Malicious PDF — malware analysis report

Static analysis result for SHA-256 47999842c07b91d4…

MALICIOUS

PDF

88.3 KB Created: 2021-08-05 18:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2bce0f50f0180d3433403fb85ef5641 SHA-1: ac939532fd9eebd7a82da079d2cd480b3831ddbd SHA-256: 47999842c07b91d4b7c583a21ac9b1d34230d1351aeb0176069e2cb14b8af88d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution tool. It contains numerous external links, many pointing to websites hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://uniontend.com/userfiles/files/37069141183.pdf In PDF document text
    • http://builderall.info/userfiles/file/fuperaxumisotasaba.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/f124jlr2rbba1t323s9n3fvlh6/kivewezelisepuwi.pdfIn PDF document text
    • http://kudusde.org/resimler/files/tifugagolenigoka.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bbc8c5d0b---76539566578.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/geputajaga.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa5950e6fc---jagilanef.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca0149647a---81029035820.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c44f7b7651d---66103314840.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/ditabogofivalavazo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/7bpq02u1o2osetqohp8bo5ol6h/tutuba.pdfIn PDF document text
    • http://recrute.fr/files/files/furinufinafadafuxadiboxew.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/kegebopirivifup.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b281922b560---zufitodalafamomufexapozop.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/dezam.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/97910154369.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c8a7ec171---gujujivu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e81f366d8---10979788726.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/busorixotelogamigugajek.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/dedutagusesedavazumofo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610690a410bb5---vubozimalo.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f4f2d1f21b707221e21d242c9e07de1b/pedanilikipuvulafarerewoz.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/vajumipe.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/lavekogexeduzotew.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/32136353258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=non+viable+pregnancy+after+24+weeksPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 11328 bytes
SHA-256: 515bcefa2c83905771382469e0c5f8a935530f16d12043da4fc6bea38502758b
font_01_sfnt_off00010df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF3 16664 bytes
SHA-256: 58f4684eda1f563634775ca81f82431c1addf4b5316998be0a48cdc3ef16a2c0
font_02_sfnt_off000138fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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