Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a9904e87a093e9…

MALICIOUS

PDF

65.1 KB Created: 2021-09-10 17:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af557becb63fbd5d93295369328dbd6e SHA-1: 5a3fcc64d343cca0e78520b01fd2ca197acbd6fa SHA-256: 95a9904e87a093e94f4ff8ce6ee7f9eeb6665c61286e820750b3235b88b94186
124 Risk Score

Malware Insights

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

The sample is a PDF file identified by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior, suggesting the document's primary purpose is to facilitate access to potentially malicious external resources.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

Heuristics 5

  • 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.
  • 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://eva.am/files/51e96577d182c36e.pdf In PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/181d251e135f3e32a7f24236fd373332/82304036518.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210904081244.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/lubajovurajalitu.pdfIn PDF document text
    • http://simoncaulkin.com/images/geredalozodof.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/kumemevijaleto.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/14481835034.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/fuxusa.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/gafedajoxuvuxotavise.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/83eada430b614f71775cc455b7196a3b/xavawevipizapobapebuz.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/xubogasabirufupituwurizeb.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/77955446191.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/58617830928.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/25275983934.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/zejaboposuwugor.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/87400143877.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a936664fed---75586121401.pdfIn PDF document text
    • https://podimercrm.com/img/files/jubogedurubises.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/76369030660.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/wagarozexutesozamajiwu.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/93975362820.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109100611296447.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/duzapubadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ocr+service+androidPDF 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_off0000ccf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 10308 bytes
SHA-256: e964c9bf4426bfbabcf367414c2bf1e23971f0e873899b2ba127e99cb622057d

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