Malicious PDF — malware analysis report

Static analysis result for SHA-256 01965857f4ca70db…

MALICIOUS

PDF

89.4 KB Created: 2021-06-17 16:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 226a1ffcb0c14aa686cb787056e62699 SHA-1: dbd900ecd56b8ec8eabf4caf312e17a8d475c928 SHA-256: 01965857f4ca70db7964fe32ccaf6dec6972b2536ef9d2b7285abcbb83d38de1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used to distribute further malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to trick users into downloading a payload, likely disguised as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9015

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://a-daily.jp/app/webroot/contents_img/files/16261303845.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0ad4431f9d14b5f47834dc3ef9704b90/zesapofesaribexewagid.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609461d1e941e---nixafamevobukoxipuropoduj.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609831e1d957a---45735673462.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160903e29ee5bd---nolekegozufegemesigixozi.pdf
    • http://duda-tech.pl/dudatech/upload/file/37411428304.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a18d1956ca1---bedumujuferoziwewutopula.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160740dd275820---81111562167.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f86a427003---fikun.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b4aebe8b046a76779631a29cdc8905bd/85847663043.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/57h1hkdkklmitqt5bbdjgnh2e5/renavilulatofenuxewifib.pdf
    • https://xlspandoek.nl/userfiles/file/guzovuxabipogiporuji.pdf
    • https://jagominum.com/contents//files/dikopixasivijaxozefi.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a333cae90---raragadarix.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b319bddd000---66725969599.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827791e762b---69084413875.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aae025e186c---ditolegenixomidakojonimuw.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/44143501650748d79433b1ee93119429/7352281039.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.thdl.org/http://www.thdl.org/Tibetan
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cinema+paradiso+piano+pdf+free
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.htmlTibetan
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d4.bin
f7fe0ce937f49bcd0e32dd46b64d092e4c13e7560976b7a593493b46f9f1c5d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 4704 bytes
font_01_sfnt_off000104b5.bin
70fc1e11e557b2ecea07cf2980f09ddb29744b87424fb7516f0358e06352d23a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 5060 bytes
font_02_sfnt_off000115cf.bin
adde8f620b4ce8cfbbeea4511d1f36fc736e92c7ca8e419c8a806c8c745e0897		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115CF 8544 bytes
font_03_sfnt_off0001265b.bin
1c800f5e47c4ce6a7f1bdc8fa863c236e28d42c5877421cc19b79ae8dae7be29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1265B 11316 bytes
font_04_sfnt_off00014cda.bin
184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDA 16120 bytes

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