Malicious PDF — malware analysis report

Static analysis result for SHA-256 6696d122092687fa…

MALICIOUS

PDF

91.6 KB Created: 2021-08-19 09:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e87e46feb2753e36fe97ef32ab7881c6 SHA-1: 4b0368d33ba86079b2c6204f677434a4ee98d66a SHA-256: 6696d122092687fa8b1d5708034cc7f2f77a8d1b3ff0244af54658f97d16d318
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://darec.sk/files/files/54181332450.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20b031c06.pdfIn PDF document text
    • http://dejede.com/userfiles/file/13584792936.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/mikonosowigebefegewuretu.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/fafix.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab8c8667f---bukojapusevuzug.pdfIn PDF document text
    • http://miguktour.com/FileData/ckfinder/files/20210622_D25FF0BEF2275859.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d0abb417---lefunawigo.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/430612421.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/rifebalijogufamefimifidi.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8gbk45kmbcdt50qhu49vanb3dt/toledako.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/gofimifixowoboka.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/d90e1365d2ae78952b25bec27eef4cbf/64869821520.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/bigikabenuwuzomaride.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/c2efa1a7268ddc59e698932ba607ff64/75795379480.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ns3h37tn0b8tj0on0gqhelrbg5/mumawuzudov.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6ae998a8f---50535178230.pdfIn PDF document text
    • http://firegallery.ru/img/upload/39746527725.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/kiselarufafarelolawavon.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/8sdbsbn1ho78giomsmme74l0ut/paralog.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/62932417954.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/c2f1fa308eded3666b2c56ec1ad07440/filafifepifuvuxukulato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=prince+of+wolf+chinese+drama+castPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 2248 bytes
SHA-256: 1e37abbedd210c52073c3a5332322f536f87ffed0cc670a51de0c29212e23f03
font_01_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 16964 bytes
SHA-256: 3b43c78233f01f37fa6bbbd567225a98b206de7784944bbf76d9ad96c48e7510
font_02_sfnt_off00012de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE9 10828 bytes
SHA-256: c8d9b93eed993f496619615b8eb8e759c39c4ba79bf0310c33370c6e1dfc155a
font_03_sfnt_off000146bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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