Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9787afcb6f23bf7…

MALICIOUS

PDF

88.2 KB Created: 2021-06-26 16:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a2518f98de1f99f9daf8bbd4d7468fb SHA-1: 35e35ca404225bda9574eb6cb193735ab483788e SHA-256: d9787afcb6f23bf796337e3bcb9a8c719ab7453cb7a2014a75328be911d9e56c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF being identified as a phishing trojan. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160988cf5d8744---15270678180.pdf In PDF document text
    • http://speaklifeiamgreatness.com/files/files/41513887327.pdfIn PDF document text
    • https://airshow-bg.com/file/logijikabidazepamupudoj.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b2d4bcd6e25---xetevamonuxerazep.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/05ccbeffdcdd419f9cd62e7bc2e4b273/78657149855.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210528011754.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/49381018616.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160805801df357---dawidokofude.pdfIn PDF document text
    • http://bakoca.hu/files/file/goxidigedudazi.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/rugojajagurawatapa.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea24a0d18b---buvipirexewewema.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c123b6359---deteneziterinuw.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/zojosutuxajaz.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/gavovavagotoviwefito.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/42783526813.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/717e793466b886b8caade0b89f4a9e2e/retunovunogutune.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/fcbe1c9d7649b4eac889ae3c44a8ad77/wozabolufajizoxe.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0472b4841---60359318478.pdfIn PDF document text
    • https://grancom.by/upload/docs/nanuripuzotak.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/99189267768.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/gobetodudukolegiviwar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=counter+sue+for+defamation+of+characterPDF 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_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 17240 bytes
SHA-256: 65d305a23c9bf37e02724351da9a71c7d5293199d45c659118fce1ffde65e5ef
font_01_sfnt_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A81 10824 bytes
SHA-256: 8107ace985e6b7034c74b882a72e42a0886d5ad0146f8f15f8b8763212a9f911

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