Malicious PDF — malware analysis report

Static analysis result for SHA-256 3629d611506c74a0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 12:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd1a5403c8c52db854fbfc1836077410 SHA-1: 60f29502670de7e06a30df91e766a59efcaa5c63 SHA-256: 3629d611506c74a0af6daf622a23112df72a3763a055e9aad598670e906c9e22
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, but the structure and URL analysis suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc74b150154---42229614041.pdf In PDF document text
    • https://tylbm.com/Upload/ckeditor/files/dafetatimazixebogibujude.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/gikomerubisosumilawor.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118811a572ce---lemik.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/daxedekogadode.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9638d17efe---81106730105.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/karivimofitom.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/23155685913.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/gevokesuded.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/24161157819.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202107031421072095.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160981b58e3306---84982676238.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/6d75e6992232dfec570e8ec6d208ac5e/papun.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/da7861edf2de9ea3fa656e2cfffd1a8e/70926784279.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161043341d287e---bapekemaxamopoxuziwiwi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c6994b3bb---59599686254.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/18717066530.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/55794315942.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/47989800858.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e7ecd8eb00c98f378d89f1bba23a7c4c/toditevogudo.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/40330693307.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/mutiwu.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/65542361274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=tuberculosis+ganglionar+cervical+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/15b5c12c4e9bcb4d57c7c31e3d566fad/difilofakarexedo.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_off0000dd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 10964 bytes
SHA-256: ece4370a369c94f091b28fce9d5e663557260bf1ad1702a1e2dda6f3c3b8d99d
font_01_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 17260 bytes
SHA-256: 32c7402d8c3a1b93f40b27c512425bab6a94ad91d18686ab36c8cb00e723ca22
font_02_sfnt_off0001237b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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