Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ee867b5aae5fff…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 04:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e1d2c9b632f2ab2427c1008d051a364 SHA-1: 6d5b9993dab73e54377bf02f022fc08c24e7de89 SHA-256: c9ee867b5aae5fff33e2c2714f0ae13dedbd2e8406d8d1cc030c9e00b206ec86
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose. The primary attack pattern involves directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6706

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 https://tw-itemaos.com/ckfinder/userfiles/files/733105796.pdf In PDF document text
    • http://hak-al.com/resimler/files/wupovukimafubamezoz.pdfIn PDF document text
    • http://ruihuitax.com/files/file/najosufokedidugeragok.pdfIn PDF document text
    • http://ymmicro.com/files/files/85132863187.pdfIn PDF document text
    • https://mbbs.hr/files/tipesa.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/femesugupujela.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b3a87c188---zasifovake.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/pivazipopamesaligin.pdfIn PDF document text
    • http://seamacros.com/upload/file/fesibanivosewiwufu.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/23173984988.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/40861526904.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/51786402969.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/68699306035.pdfIn PDF document text
    • https://12shio2.com/contents/files/rexozeginef.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/68397785990.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/kebonub.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/soduladat.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/cf10cf5d987bedd25fc211c36568ccdc/nedokazutapaxakedexuval.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/wenuk.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/33296226890.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ccc5b0aa6---ferevipa.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/47086484008.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/70239510958.pdfIn PDF document text
    • http://newshop.jp/archive/file/pokovamerat.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/31080441271.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd7d469f4747ea6edd14b564b15c48a7/54900434201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=noah+harari+pdfPDF 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_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 10024 bytes
SHA-256: 1bb65649df119b5bc9d6d8f7bc161efef7f0db16914e0a55a904802b9864b635
font_01_sfnt_off00010e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 18172 bytes
SHA-256: 33718d495d844cc4fc13d45644d08fa94fe8c1bc61646ad3ff89d101695c8966