Malicious PDF — malware analysis report

Static analysis result for SHA-256 75916bdeb0b61963…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 13:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e5ddf479fc4ec5b9f9f516460e98b4c2 SHA-1: 352a62463e79d70aee712e547c4dddc2e63f8e71 SHA-256: 75916bdeb0b61963938ffc78c3f55555050da5c5626108723823cf3bb20edd2d
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=hip+abductor+strengthening+exercises+pdf PDF link annotation
    • http://lphs-the60s.com/clients/5/5a/5a84a5cabe7f31a06b4bf99f7e1b7ad6/File/lobimibipaludekowobuzepu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21ce75d83---zemimugarogow.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/4403389966.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/23720866087.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/14965598436.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/94899102254.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/39445437292.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae5e6dcdc---gizujidaxex.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/35253434499.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/daf7cddc52dd2cfa8881642ddb41fb7d/fotakominipusebepu.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608089ff6f8d7---86010833574.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/kuzudutumarutilelixupov.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/211131860.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/08e1d8b7cb59ae0e992405b18fc45143/winopekugotebelemuvomip.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/dbd037631130f7ec533891c66e3785f9/zojorunuxe.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/galawenepun.pdfIn PDF document text
    • http://gptools.net/userfiles/file/kirumu.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/fuwozaj.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa289c79f2---xumufokumowumuzavum.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/ripuzizigawetudona.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/69107972369.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/wikapalivutoweseme.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080f25f7adfb---95350107186.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/52667259335.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_off0000dad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD1 17408 bytes
SHA-256: f223d331988fe824640aada3b70706c4e0d3c647f3e37ba6e495485286241808
font_01_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 11188 bytes
SHA-256: 5aa37436a0e8a0394a91886706d01b8e7e084ae87f008052cbe6ffba71f9dcc5
font_02_sfnt_off00012181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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