Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecacb93e8c7fe62c…

MALICIOUS

PDF

81.5 KB Created: 2021-10-09 17:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b74b18a9facb196aa8ec6d4c54c3ad30 SHA-1: bbd03aecdebcfffce0a89bf25b133a73ff9ed875 SHA-256: ecacb93e8c7fe62c8f04b308dc86f86fdb89358ade34f613821e97241feeb9da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=checkmark+and+x+symbol PDF link annotation
    • http://asirakademi.com/resimler/files/26462854106.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/4104320306dc57525d79aa87532b2ba0/81932419462.pdfIn PDF document text
    • https://kokomanis.com/contents/files/37208754001.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/22538605170.pdfIn PDF document text
    • https://udruga-invalida.hr/files/sumaduvud.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/15434111628.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/jusuwaziwenib.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/91495503965.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16150c0fa57769---60714010025.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/zigopawetejuzi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321db0bdc2e---8508791568.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/mapugarupevu.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/xekopetefigezawutevel.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/jigijufazefexo.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/11599772178.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/27208691940.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/98510868475.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/javedumeki.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f0da225736b7f67b09ebf3d66eefac09/7444588880.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc404d6d1---32758038995.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/luzuniwuxo.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/gadogulabeduvunilatile.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/suxal.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_off0000d3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C1 10924 bytes
SHA-256: 02e347f7d921f5f215b95bbb2aa390d58e3d05593ba3ec7b48ffc148a109d266
font_01_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 19808 bytes
SHA-256: 0be2e45ad2029e77e5fa1f51162ce16952c1d9ccfef51b4038bb4dc1f7bfae0e
font_02_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1