Malicious PDF — malware analysis report

Static analysis result for SHA-256 627fc4a89c5ae4ef…

MALICIOUS

PDF

86.9 KB Created: 2021-07-10 06:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 731864488d3d9ba70a6ac69556cf6060 SHA-1: 8b8a6e2a84dadd02b7aad879c8e1b447dffa69f8 SHA-256: 627fc4a89c5ae4efa6fb18c73f26be0a7892cd62928d38924bc219cd854848d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to host malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a deceptive lure, such as a fake invoice, to encourage users to click the embedded links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://archism.ru/uplcv?utm_term=document+naming+conventions+best+practices+sharepoint PDF link annotation
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8097331466---15812750972.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cee204081c5---rumag.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/18872776142.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca223441db---78268551839.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/farthm009414313cb0gljr1ce4/petawer.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16071e1f76f687---sefakijubepetuleju.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/xisigi.pdfIn PDF document text
    • https://isleo.com/i_photos/file/sigavanowolewafukilegeki.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a00e868b8---telilonasisabu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcc58da956---dolaje.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ca29ce6e3c9bb3a906f26b4cc0fbb2b1/22749999169.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/kejewumesifaloduxu.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/77116034354.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db777e0d7---48902037090.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/19331829668.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac50de9888---78533460558.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/sut97mi487nbcd7r0t5g33al56/pepesuzazanovijumejiwan.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/onps519q2f36vktg8fr7dh9dff/dedovalamaduxemu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/demujoxede.pdfIn PDF document text
    • http://grupophi.es/uploads/files/vibikefub.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/d2bbc4667ce5b4d49edc6aa0927c09c7/6789648189.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/90cf87318f83f7d841b91ef8579307ff/68709510780.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/vsn4gkdn3g1ar0if953a36b2c1/bibod.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_off0000e4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C5 11080 bytes
SHA-256: 03e6523fa018afa5ffa2c4b612756a4cdf46a946f89590356965a109bafe3bb2
font_01_sfnt_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001164f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164F 21024 bytes
SHA-256: a7a342a572d7c6126183303ce9dddf9f4021d3831f1a01947f237e6e0f105287

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