Malicious PDF — malware analysis report

Static analysis result for SHA-256 af21499c1ed968fa…

MALICIOUS

PDF

80.0 KB Created: 2021-06-30 03:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 947ab9077ab32b17ebb67104faa85a97 SHA-1: 4af86c64c07e070105a28b845f0a2b40498ed2c1 SHA-256: af21499c1ed968fa1bc3c019699955fa58b604adabfa04b6015d736cad5ef0d2
94 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6083

Heuristics 4

  • 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 https://dutchfansitenetwork.nl/ckfinder/userfiles/files/duvubasusapenetesugefuxi.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77a94e9bd---gowagijofutirolazije.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c92311c1450---71132318829.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/019609c3ecb8ef6c45707f375b4b1e47/65846808155.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/20879203177.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/51265713ec5a55062a4222c4a4498f08/24421863575.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0e16f6ee85d3ea7600d47c511ff18130/julewijogezaje.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cafe16daf6---75271361933.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/vakiwewu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab90d52963f---rinemolizomodufiwub.pdfIn PDF document text
    • http://abpaluso.com/upload/file/jufawofevupetab.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f728868c---17895506867.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/l3jndqmn7r2u0ln13jnhbqqsrk/pafufojorebonidabakizifov.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/52845642824.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/69627537182.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/51269060978.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a397808400---51683438672.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8e24256f6---25922902148.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/06/17/bavazek.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/582e956810fc7f298f0e613f1bea53d5/92945651007.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1c1c83624e6629c2b4a075237ccbdce1/59931111873.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083730ce2d75---dodibapik.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd78163c61---powukirawowelibikepi.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/pojitofo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc2d6bc32b---47246909570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=just+one+touch+and+then+it+happens+everytime+lyricsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 11052 bytes
SHA-256: e3f9ddd0d56912d1f0bcd7e8b5b21f4b99f307478795c94d55113ca8616a6b22