Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d280af3d0adea5…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 02:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5c0bc90da6c8fa377d75fd2ce5348488 SHA-1: a74aaaf197f40390a80a20dabf49e29b24d7b449 SHA-256: e7d280af3d0adea5089ea469f722744fa4080962fb06a65b35dca575546d7dac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs on compromised sites points to a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e139df317c9a0c188a776665bc7cf348/44162875661.pdf In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729b2e256e8---78030179025.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216231828205737.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/54031937716.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed375625b9---sapakojufinajojawufibalo.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/70948250115.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092a8572c3c4---90968378822.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160703f716eab2---lifobilazexebemo.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1255c14f4f171e3e05e3e32c115bd17/zuzipivejazovimaja.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab5b7cdd75---zijipatesifaduvix.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7504c1c9a36a742cf4e1f1549e9322c9/2309530822.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/wupipaluvojitunelog.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609774c56b9ed---84354698036.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b8daf04df31485a12841647d7c5d4689/60448938310.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/nozewiri.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191115253565.pdfIn PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/dunanebuzimawibixame.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/76703016896.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/651449192.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/pi109b0hp75c6el6i2vjj6h4tg/15315009899.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/26193183910.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/retijaxesiwosifoz.pdfIn PDF document text
    • https://citytrafik.nu/images/file/gefixumupokelanaxegaze.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/9ol7aeun9srhjhrqftg7su7dc7/tunovovinujowogobezul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=convert+excel+to+pdf+free+software+download+full+versionPDF 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_off0000ca13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 11000 bytes
SHA-256: 7dcf8cf20466fbaa0399544cc1402a7bc456567a3277ada46ef364db2af30ae8
font_02_sfnt_off0000fbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 17932 bytes
SHA-256: 663d027e3aad48d7ec3c8e8d7dc1d40e607ed7205a22afda05ece38bfd2f0e9a

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