Malicious PDF — malware analysis report

Static analysis result for SHA-256 4951c97b03a9ae29…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 11:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7e86cd032ad269024e7ce2af8313953d SHA-1: db6c1f31f879a14a2f75a8f3a1cb7ced1a553bb3 SHA-256: 4951c97b03a9ae2924738cb2c22bf86a74bef17dc78345c34c91c36751633414
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure suggests it functions as a link farm, likely designed to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=elastix+manual+registration PDF link annotation
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2a6221e136dc0c10b975e945bea8f88b/37193189692.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b442421d0b02749d2953b2c603e80811/36907668029.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/51073651629.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/a7d0a4cd5c11ca53d764b429edba60c9/kazeketeto.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/rulobababavedoz.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/48531975657.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/95115127751.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/ligomekeda.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/s4mer07u4lmueq92ok98sufnck/47661439385.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/95489814642.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/foduwilipijumunub.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/48335eb1a72d9e7e2e2352043a8535c2/gujaxa.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/fda97449d4f2c6c3972d97966aadd41a/xudasuja.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/40431356262.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/puxifodumiruzisasanur.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/88753882515.pdfIn PDF document text
    • https://alutat.com/data/file/podamitulixivuzoda.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/fetuvuxaretaluxa.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/83474304596.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/xegozodotebin.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608378e68ea99---60084185092.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/xixizakumajan.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_off0000e117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 10636 bytes
SHA-256: 2455e40af9b7891836c33f21d4aad5ab777ada88c220796203f528b2a2636ec1
font_01_sfnt_off0000f969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 18072 bytes
SHA-256: 0f8f6a0be309a0e643244f1d779bf6b1b113c9c94aff8c36d9eaa5c3cabda233

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