Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61cdfd17f7a606c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 06:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6c2354afb25e2051cf907e5c9367a8d SHA-1: a392372eaf9a75834cb0a689b26474eaa0472e15 SHA-256: f61cdfd17f7a606c8658503525418246d5d99d6e1b62950ce09f0e62602ed16a
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, suggesting a link farm designed to trick users into downloading further malicious content. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and URI heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/59348500109.pdf In PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/famavojibogi.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/3572209094.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2e640be04---93083586287.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/tuvopinosomuk.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/43193652281.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/xibuseragapewaxofanulo.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/dumabikubaposopup.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/37461601098.pdfIn PDF document text
    • http://chikatere.com/Upload/files/bemud.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161498005636ca---vifolaja.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/wenagukajanovot.pdfIn PDF document text
    • http://njxinbell.com/upload/files/32523023158.pdfIn PDF document text
    • http://swhos.com/upload/files/fekopuriwunabojutowo.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/javeruw.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/45599951757.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/19460245976133bf1553843.pdfIn PDF document text
    • https://kueapem.com/contents/files/manozoxepuxezupesop.pdfIn PDF document text
    • http://bluebossa.pl/files/file/65889139999.pdfIn PDF document text
    • https://mcsfood.com/images/file/98622267904.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614f03037931f---kamekesa.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/nefizotunali.pdfPDF link annotation
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbfd28b86---jitupigamej.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/12625552443.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/sodapanewumiloterabab.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/49773676030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=legend+of+zelda+breath+of+the+wild+soundtrack+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000b298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAF 11192 bytes
SHA-256: 2c82796945864d85078e2a5e7c142b9b54bff4bfba992a9b9943f8d984d85454
font_02_sfnt_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 16108 bytes
SHA-256: 65a74f233269aefcef11e1249d90304d898ea8a33022b2512563a9df6c9c469f