Malicious PDF — malware analysis report

Static analysis result for SHA-256 e925348eba81f247…

MALICIOUS

PDF

75.8 KB Created: 2021-09-13 19:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd5b86480da429e7d027c15dbae9a822 SHA-1: ce2e98cc6dd979e0d17c62b87e2144242e0f6fdf SHA-256: e925348eba81f24736986b5ec5f265c3bb0341980a09298629292ddb3f5c123f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term' in one URL suggests tracking for malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=skin+minecraft+apk+download PDF link annotation
    • https://trieurodata.ro/images/file/ximejukexodiguxesimigir.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/40510333900.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318c99b3611---patukedel.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/47782236734.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6e3a2395---jujukomisegiwolemigim.pdfIn PDF document text
    • http://okvin.org/userfiles/file/vamanixofef.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210909150920.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/98038489690.pdfIn PDF document text
    • https://media-get.com/userfiles/files/tugeg.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/kotidibuzinag.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/5045596378.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612f637899029---66968017424.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/tazenozokaja.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/27607980344.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/toxuvolizadase.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/33199049057.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/wawarepenivogadiwutibup.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/58838744103.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/gitifanadotenafotozinila.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/58940882543.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/82116266997.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/bokoxorakun.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/donuparoguva.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/55557917091.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/bemonegetaxojowipepurapu.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_off0000c11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11F 18232 bytes
SHA-256: 1790ec7da6bdbc269e514171258947f240c2e27b584a7bd59e21d1d8ec426f78
font_01_sfnt_off0000f01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 10868 bytes
SHA-256: 0b1089fca2b9b4bd31189770ebb00190fedd433b597770369c5b37ef47a8f600

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