Malicious PDF — malware analysis report

Static analysis result for SHA-256 14df3b578e40e92a…

MALICIOUS

PDF

84.0 KB Created: 2021-07-09 07:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd2f4f336f88118321d2cc2d987fd331 SHA-1: 00dd387236e2f7fcfd89f4c20e920ccfb0fce36b SHA-256: 14df3b578e40e92ac174ba54842a8b2b5d2e7f89808c45db7769e026f4d720c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous links to other PDF files on compromised CMS uploads and disposable domains. The primary purpose appears to be redirecting users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://quaint-house.com/images/blog//file/sozukirewakobabepemi.pdf
    • http://mitcostruttori.it/userfiles/files/labirolu.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2ee7gribptb5bv5mgnq412p1p4/75408172512.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0fc2a843---66086364254.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a12eedc59e---vimovo.pdf
    • http://bacsiha.com/public/ckfinder/userfiles/files/tatiremasudetisusuf.pdf
    • https://betenagro.com/sites/default/files/file/jibukolix.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/6fce8d41c61ec1872ec045f0247ba7cf/3951976262.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/68303264524.pdf
    • http://bmsorganica.com/userfiles/file/fevavurekapevanuwemu.pdf
    • http://aite-materials.com/upfiles/file/botoxijimodevabotoroxa.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/aa798e76054ce72b0270778ae85f3664/35468435862.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/45ca5da947af61059dcd43317cbbb84b/ludigubitimaja.pdf
    • http://acecaalcoy.com/userfiles/file/62099643257.pdf
    • http://dnepropress.net/files/file/48236607687.pdf
    • http://andlupa.com/userfiles/file/kotorunuvelivawuto.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af423aaad8d---663007473.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/nk8c3g886tif8dj6c0v37udabk/jaxemuterunisu.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4879f8638a01f6d79c62501be328dd65/82910474892.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb2eb30ba---86141031351.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9f592ba1a---64363359462.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=same+weight+but+look+fatter
    • 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_off0000e766.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 16792 bytes
font_01_sfnt_off0000ff78.bin
562822c8a9140e0a16b921c417437a2f4c094b501a763009fd88df9a2284aefb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 16392 bytes
font_02_sfnt_off000129ee.bin
e8c23bbc0f451b2949b9890ee88c77c1ac00c39b9f4164511038ee9145f995f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 10884 bytes