Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e6abc2614de833…

MALICIOUS

PDF

96.8 KB Created: 2021-08-31 03:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0e6bc8caa1a4e139b8c22778ae9813a0 SHA-1: 4e13c96dc3f4adb7406de81126f5413b1de0e31e SHA-256: b1e6abc2614de8332c4924887d17d37626643945075dbddef2587404766e4dfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b5ec0311c27594087c05e5efa76b5520/27846296828.pdf In PDF document text
    • http://turagent007.ru/userfiles/file/jumadukokivetivepexi.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210723231001.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/bunopono.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/tua0lgam23kgh261vb0ktv6980/2632561632.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f8564fc5---63684240282.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b8523f9547dcc68522fdf2cde453bd39/gunapuvujeked.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/lpj9jujcoomhuusns68rpvrn4i/kexalowi.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/dekinodexonob.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/bufajiniviginosonezefut.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/febusijatexabimemirame.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/wipotajipabuvixojigadujem.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160efd7ed222b2---34712166972.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/bulavirijusixebomited.pdfIn PDF document text
    • https://ms01bet.net/contents//files/latozarexujav.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/pezixopubogit.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/5338473486.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630173736.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/xipuneziragunupomuboba.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/43155740894.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/26466493898.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8e4030e588f769456165261f6e798e5d/31156691202.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/36307543821.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/jaxozeweniboxona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=forex+compounding+calculator+excelPDF 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_off00011759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11759 17288 bytes
SHA-256: e2875545d2434bed80244dfb5aa769754cb84b416f30cc6cdc729a38c0f029bb
font_01_sfnt_off00014414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14414 10868 bytes
SHA-256: f3be668b76b2359c3e0b3776e2cd1e02f9764f3cd54ac16b60d68cfbe16d7f7b
font_02_sfnt_off00015ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1