Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa58894da84afc7…

MALICIOUS

PDF

78.1 KB Created: 2021-08-18 15:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a1cda7f5a698260537b70bec061a94d SHA-1: 0874555ecfa96e140f22dd37272919b4413e2c67 SHA-256: eaa58894da84afc7100e17cfad0b082cf99a35e7b81ae26858b0b4dd2459de76
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9183

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://cochu.net/resimler/files/76151984228.pdf In PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/kuzelesekunaxupufekeda.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b8e07d573---82398340514.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/0eafd9e97a3443d4f8f1c2e612e52f34/wabapirufev.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/28509369230.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/57957905986.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b44e7aaeca---66403212139.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/nejibuwimi.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/lejogul.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/4952571103.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/pitedubowivodi.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5qdou4o4j6fo7k5ef9dq079ok/sevaginatoxebagetizufi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e99c4168b---82330974714.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/zigazenagoj.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608572d1148d7---xinukejowumofodagufije.pdfIn PDF document text
    • http://jngf.cn/files/file/welexofewokowizi.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829347b3502---purubelopigemesidedet.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/zoxupapebuxu.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/jotenekumemukim.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609c98e29f717---59243473334.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160830877586d5---37974374426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kane+chronicles+graphic+novel+book+2PDF link annotation
    • 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_off0000dec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC4 16780 bytes
SHA-256: 887c7df90b0a612baf4160b6c68932ec32e561c893d7c5506c535ae940917081
font_01_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 10964 bytes
SHA-256: 772da9327c9afa4479bd08ebd458daecde759dea6035b2ba71f3f4d5561604c0
font_02_sfnt_off000123aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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