Malicious PDF — malware analysis report

Static analysis result for SHA-256 9407aadcd5dcf9f4…

MALICIOUS

PDF

93.7 KB Created: 2021-07-20 03:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 33a3ae4eda5fc86610cf64a9d2599fe0 SHA-1: ec518b7ee4a7a3c83a1d7a56b2f344fd6ecf7b95 SHA-256: 9407aadcd5dcf9f4b38d1be07b7296a07f0d0a357aa1a07275894ebc55847cba
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm or phishing lure. ClamAV detected this file as 'Pdf.Phishing.Trojan', further supporting its malicious nature. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier clean score 0.1938

Heuristics 5

  • 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
  • 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://kinel-hunter.ru/upfiles/file/93627232968.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e75104816dabfd14ab8cfee232cf59ba/96886829290.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/545b6c1042b562269dd5f5a6cf859c5d/livonar.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/41686341749.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/no46kl65pcpsasdia0vfv4b5q0/96459698094.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609849631ec7a---fopajowuresomuxerifem.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210523190859.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/wemuzopifiratisumix.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021071714345198.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/63813832170.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/91611383443.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/5af792a5c268cc139f0c06edc24e0618/46893233770.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2q6n3ein49gbf9eiur72992rd6/29341341168.pdfIn PDF document text
    • http://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/kiduzanadikulirunezoli.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/50309366241.pdfIn PDF document text
    • http://wohingltd.com/userfiles/firaxadogoxedowurub.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9d5640e76449e01f08b1eb5d14406ccf/57319304630.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/wogobenawonimirenapola.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074789b68846---44354183447.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e7fb14950b8d34061bcd4a711bba0550/bogiwezavu.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079fc0e836b0---14284029660.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7327bfd0b---14272818992.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fef74a6e9---govafewaritukotuja.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210707084410.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/xojaluvofasagejejelewat.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/zewonujogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=baby+plant+after+germination+is+calledPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D4 19012 bytes
SHA-256: 2f9916350292f2ef55eef749add0dbb647d4535505dfa8d6bbd09d0a4359fa0e
font_01_sfnt_off000152e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E2 11272 bytes
SHA-256: 60e1c5bf3b2a5bf4f26a314d9c3a53cb7d15470fa4c6660cf8d2f6a3b1747848