Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5dec05036a6158…

MALICIOUS

PDF

70.1 KB Created: 2021-09-03 05:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5b86babfeff13e2e654cb652b2d1681 SHA-1: b2f6c0007bdd6f81828bc424d403837589b8f959 SHA-256: cf5dec05036a61583efb4b700f24aac7bbdb391b2e6cc06e072727f352893a68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to disposable hosting or compromised CMS upload storage, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although 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 0.9975

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 http://jatyn.cn/upfiles/202105/file/1620917638.pdf In PDF document text
    • http://elite-nails.pl/Upload/file/nosimewuwoxedofila.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/vegixanewologej.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607011edc19d4---xabarawalolad.pdfIn PDF document text
    • https://aneri12.eu/res/file/94920958539.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/bdf717b0cfe3e7b4dab1f80d7347691e/bakejazidogipovofemavido.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/072cb0d1433089b9f3d241140c81c19b/95930504364.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/54588496847.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/76827825066.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/57390085544.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d26df7ae78---dorolabamewivew.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/66603150804.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c336359c73a---visopowa.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/nuzifidetoxedapenok.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720f9b4d3c9---96894003981.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e316fa3554---56384673132.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/wuzopubogira.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a57db76fcc---23482030565.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b88402d3e95---15648762034.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/65585003942.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/gowebatajenes.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/jatokego.pdfIn PDF document text
    • http://ashioke.com/images/library/File/46124289898.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9286889098---68769559181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=plasticidad+cerebral+en+adultos+pdfPDF link annotation
    • 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_off0000b45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC72 10856 bytes
SHA-256: 5b9d9ff9180c52b1f7ddf0e7fc0d369ce1d56bf6e88ca744bf95b087919d8b17
font_02_sfnt_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 14960 bytes
SHA-256: 10c0b35bc724a21e70440d0293be41e85e2f8f797c6982d04ba1db958571d0ba

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