Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fddc73e6c44b0a8…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 10:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 134e3d7a3e488a804991cad85dd48a89 SHA-1: 66a7fe6c932eefeab53089f4824a9445dae1fef6 SHA-256: 5fddc73e6c44b0a84f186de72d2e574988986e1f7898928a1286e0642f517977
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the use of compromised or disposable hosting for the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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
  • 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 https://yaofangpeixun.com/upload/files/mapizewiki.pdf In PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/poxaburakoje.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/64637535280.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422bcc4d845---wenufanetarotodamuf.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/tufofolemomunezamepiponep.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/12367122367.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/luted.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/72997025325.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b631a7d3239b44fcd539d96f9277c224/14913502967.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/zevujoja.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/si1enjpa1eftlacp4o5kci6ge6/84617040423.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/womimiwepir.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/nanabosuro.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/topegakizugorusuk.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/16887616867.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/75027974178.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/41333425183.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/8eebcb754f0c6b18b395539ed8de7717/95947851928.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/19282757083.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161374c2d8eb2e---78603583121.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/zizovoru.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/zafatukegixilajinudamiwit.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/3169188051.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/18470433067.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161422356a2bf3---balikijemorufim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+sdk+emulator+linuxPDF 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_off0000cc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1E 17076 bytes
SHA-256: db9360939a67cb08b67fb860e099b4cb67528b71bc6acb2f13724f2271d67523
font_01_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 10684 bytes
SHA-256: e666be22b2cdc25fe556ef9ed9bed78b0feee2869abaa69b4eaa2dd0e30fe7b6
font_02_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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