Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69a635c5cd0d251…

MALICIOUS

PDF

78.3 KB Created: 2021-08-17 19:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b998a3d315b7c21b32412829a8dd2380 SHA-1: 8934ce4d2c5e675507698fce0510f2767fa65f8c SHA-256: c69a635c5cd0d251bd547316e8502af9b3e3b2ceb6f5292a840ecdc8dbce9ddf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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=more+practice+naming+ionic+compounds+worksheet+answer+key PDF link annotation
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/02b4dd1228fbcec3e4e5c04c30ab0442/56446321254.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///24791198586.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210507042615_142619180.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/2786644522.pdfIn PDF document text
    • https://hse.tw/upload/file/21798269587.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/45534506618.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/767968e890584d9921c7b67bbae590b0/rikajujafejezojege.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/76638783137.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/72888168098.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bb1eeec1b---xixuguranadedurilev.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ckkf991fshmmraq60m8nr7g6gt/72217505180.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/4d0a21fef0720f11e5e329019062b48e/5698005354.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/82295350848.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed1360706b---53835788551.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e95aee9670f4eaed2e097f27188faa53/74953150997.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/10b03966b67808eb11580aacd759c407/33187778490.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/eb2e48592013eded998f8335abfb6654/potelipekobitedugorekud.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ajn34rvrubiq5fb3vv1r94v6s7/najixebegixiganesix.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/0c5c86aeb56c88237d1d54cc31f30ede/54781816853.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/79477259251.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/80314185799.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/49612388159.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/42683846705.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/temezamosakefupuzusezixid.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab5d2a1fc4---fegewedetunaziviw.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c6859584---49952844877.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_off0000cdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 11300 bytes
SHA-256: 1befa1440d85f2a8c1b362aa74adc1781d6d2e5f171597c815c1407f8ff79d09
font_02_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 16376 bytes
SHA-256: 25b40692e8696ec59a343fe826e9a91236890b04dc512e57c4d0d2028d38f346

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