Malicious PDF — malware analysis report

Static analysis result for SHA-256 285cc69c9613d870…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 12:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 71fe3b92bda83cf25d1c3bc70420547f SHA-1: 31c5094d912987ddf4dcab4527ad21a59549be4b SHA-256: 285cc69c9613d8703ab243a775b2159c1ef9503b237a7d6fc1c70e6bfea8b49d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=understanding+physics+isaac+asimov+pdf PDF link annotation
    • http://artgrafika.cz/userfiles/file/ziwejesudekejudavaveneta.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/15554422.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/voxokinalulo.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/63854671725.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091209234573499.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/mosuweruvaguli.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61386c4fc78d8.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/22059778924.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/11533155128.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/38591499684.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/25114614302.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ad64a0da---67235627578.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/82427700004.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/411540e44cc561da591c12fc7b492fa7/wonig.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613557f9eccca---mimux.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/mixemezakugopiso.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c87d9d88d719587464ae1c92fad1402b/78399070369.pdfIn PDF document text
    • http://deforma.it/userfiles/files/weparasi.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/fejigivepubelakij.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/aa1aeccc720c3b83fd498b42adf8a469/kukodutenifelumi.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/mogebedibibuvap.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/25387491957.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/58216152483.pdfIn PDF document text
    • https://vzglavniki.net/data/file/21820939767.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/u237qao1o9nnuqhg2t44s2idlu/98602737922.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4dac45a41---46905993952.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_off0000d797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 11208 bytes
SHA-256: 7a3d1a7afa5bbd39404eec6f32056cee5128a6f8da6dfb1865a8fc58b03005d9
font_02_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 19108 bytes
SHA-256: d611de63c1d6855aacac7b956a18949c93844a72da80da29c18243348f3d4c54

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