Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd59d5f6513b980…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 20:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 751a1594d8a2e1510be20791aa9e48e2 SHA-1: 4282a4e7e26ee5ff54aa128484ee125476d509c0 SHA-256: 3cd59d5f6513b980df74ef724def7cdcd636e2a547c22534b8a3d69a7f2f5f4d
164 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 disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of a 'download button' lure further supports this, although no specific script was extracted to detail payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=fb+like+apk+download
    • http://ichieh.tw/uploads/files/202109041421533044.pdf
    • http://familiegravesen.dk/userfiles/file/58599601913.pdf
    • https://conexusinternational.com/ckfinder/userfiles/file/41049511170.pdf
    • https://vinocastillo.hu/editor_up/fezunan.pdf
    • https://birutelorasin.com/contents/files/walaliziwoboter.pdf
    • https://bravo-hk.com/userfiles/file/49741159672.pdf
    • http://klusjesindex.nl/images/uploads/41815489269.pdf
    • https://keluargamimpi2.com/contents/files/67068661526.pdf
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/43481929972.pdf
    • https://maytinhdalat.vn/images/uploads/files/doratubalosufibipojuv.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/fotijez.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/80f065ef643a7af076f96a12dc6de184/46533422009.pdf
    • http://kantipursecurity.com/userfiles/file/9902615019.pdf
    • https://inprovitbrasil.com/ckfinder/userfiles/files/82690079374.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614030a792366---fiwofaseliloxibuvarow.pdf
    • http://ettorebelfioreliutaio.it/userfiles/files/83527786399.pdf
    • http://tunesistudio.eu/userfiles/files/88395343788.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb506bde3---rerakevonudubosi.pdf
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/30098047678.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f1294115f---11284652984.pdf
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dipokijutefugo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d006.bin
6a7f44d8d8fd9544da9f9e27fcc8bbcddd71c1d1f685e68af7f45e23ff743ccb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD006 10316 bytes
font_01_sfnt_off0000e721.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 16792 bytes
font_02_sfnt_off0000ff33.bin
6cf1559948eaf704009fb987efe0a5711c43f80da7fcf45c06b0eaa0e7c16b65
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 18208 bytes