Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e35d04657048e6…

MALICIOUS

PDF

90.9 KB Created: 2021-07-30 02:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26b6f49c3105ef7e62d600c978aad39e SHA-1: 9c85935f1a4093abbde1deb82efe44d26cc03da9 SHA-256: 99e35d04657048e6555b536b4ddf61b66192f64318b75fed867712aee6c4f003
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to manipulate search engine results or distribute malicious content. No scripts were extracted, but the primary attack vector appears to be directing users to external malicious sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://pistant.ru/uplcv?utm_term=dead+poets+society+book+age+rating PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/it0p8ek1j2m21hbtkiqclt30i3/15704170546.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/dasupunogikujawanepona.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eab44b4a3---12208203644.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a577f759d72---mutomidovixuwex.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/rafawexuxavila.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d5e8bc58f---32227664531.pdfIn PDF document text
    • https://tonitomov.com/picture/file/11963085179.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/bokewatufubizumabexotolon.pdfIn PDF document text
    • http://fitviewer.biz/files/file/watelozujaf.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/91ce59e3d09f0a38d463c53dad7033d5/pogirawonotugelakix.pdfIn PDF document text
    • http://beiks.info/public/file/71624174993.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/73550716519.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/c31gbkkhvnkbj47ldiem4ukhae/14646609370.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/42aa7db1a4e9a0aea0304de2dae08f46/sivakiva.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1bb2f5f14abcbff942cfbba82c0b9de8/21694095876.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/27354298000.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d17041c983---60577328905.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888759bdbe0---fegifuxisexadiw.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/87061627114.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/tktrncudn9r2vut090ps1oq3fm/nikazurafasedijo.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ogfii3ldpgpnaromrea7tktbfp/kuxezupuvujevizobamasu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce08a558a8---7472313537.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/88306962849.pdfIn PDF document text
    • 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_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 10992 bytes
SHA-256: 06ca92766b70b0d5eb29f66ad26624f111d46d0d7c5bca3bb94d44551db7d294
font_02_sfnt_off00012fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE9 17080 bytes
SHA-256: a51963d0a6d8abad7e61b4dc1e90a2fb89c6750409abbefc50a02cc0e0ad8a3b

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