Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe8bd357e8c8990…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 07:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19ba05271c63dd7b8bd418a4a75f5d45 SHA-1: 035537b18b7bcd20891802e65ef8f15eed5f379f SHA-256: 5fe8bd357e8c89906282cd80114a975ec50ee95fb026dee8db994f6a99afd9ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous external URIs, many of which point to link farms hosted on disposable or compromised domains. The ClamAV detection and heuristic firings indicate this PDF is designed to redirect users to malicious content, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier clean score 0.1919

Heuristics 7

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://neoneofytou.com/ckfinder/userfiles/files/27317504649.pdf In PDF document text
    • http://studiocalcinoni.com/userfiles/files/buwoleka.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/56673564369.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/wabotumamojirowegorovo.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/105b63c7c9d7cfa3aed7fe0573e5c38d/tuxefasobafugixarepiretib.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/52431244290.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/sososazogebubanokulun.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/dilijewetuwevaxiwufej.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/2102566500.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/jutasi.pdfIn PDF document text
    • http://snsi.jp/image/news_file/tozef.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/luvimaruz.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/lupukodi.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161406955490e8---gelulisules.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/lemosanag.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/77898407962.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/pilevakogoz.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a3ac4cf47ac7f68df90bb1a587bcbda0/24333590163.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/lizufupitenaxosivat.pdfIn PDF document text
    • http://topp.pl/_topp/file/31331657273.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/83296415706.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/38706953708.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/19f91038722f3909c4d357e2737ee493/xukudefakipupos.pdfIn PDF document text
    • https://beehaviour.nl/userfiles/file/12541522530.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/39374272360.pdfIn PDF document text
    • https://pmms-online.com/assets/file/jojaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=snapchat+pro+apk+download+latest+versionPDF 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_off0000b3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CD 17276 bytes
SHA-256: c710a1110b58ce31440f4fdc462bf7a0e15f6e570435e9af4ea474a2514daa77
font_01_sfnt_off0000dfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 10928 bytes
SHA-256: 43a47f2591f90305bebfda619a973c95be99bbde820e6c704ea05dd2a7a93146