Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0869a460f9a3287…

MALICIOUS

PDF

91.1 KB Created: 2021-09-04 19:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e27e9f10ae61e202fe277e778ab4b350 SHA-1: 3638412f95cebb305c532daddc4ba328132e965b SHA-256: c0869a460f9a3287c2effea903a53494f9c7475110b1016a852838bdd5af17a8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple suspicious URLs is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://smidgel.ru/uplcv?utm_term=masud+rana+new+book+pdf+download PDF link annotation
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/ifl9ktd8sm7l44dkftpm5tondf/nifuvakanatozepeguxo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160780e86847ae---33051021893.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/82531672450.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/aq3h3sg5paof16ogcaod274i65/51596884228.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f1d26f9b7---9545610884.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a11bb08a92---jemamofolodojilevowu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ef756f214---1463055280.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce28a11fe4---jafexegeke.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/gejodirifikedusupak.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-10/20210710185230272918.pdfIn PDF document text
    • https://austarpharma.com/upload/files/vasozezenewedavobudakuwis.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/1d1ac2e19a4a9abfdb94f199830206f3/21125002732.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610886f019814---tigunux.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9de81e62cb3461f97c302e740d3bbeb8/mepupokoxamujujamemoguri.pdfIn PDF document text
    • https://ikima.fr/uploads/file/muvuzojatusumi.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/759a6a0t92dfqs4nfk1tnj49p3/41272722644.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/ocrdemb6brpcftq6ggehhnduar/88667322146.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/begabimafamor.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/54687548481.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607582d243bee---tavutabivafoxabudako.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/74093677029.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 10712 bytes
SHA-256: 1f002af9f780538ae857b15e40a051ddd42dba30a18d6ece7c3a23967c4b9cc2
font_02_sfnt_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 16356 bytes
SHA-256: e96b8d65d0f583571d906bcbe7fb95f7ee4d4582435199a118ac4984cba72000
font_03_sfnt_off000118df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_04_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 23488 bytes
SHA-256: 7955992238f39139e27a5bc9d0ce1534bc880cc61d67c2e6f59d8acd3e11fd48

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