Malicious PDF — malware analysis report

Static analysis result for SHA-256 8297bb69abb9d1b5…

MALICIOUS

PDF

74.3 KB Created: 2021-08-28 06:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 006f8c2be709c176ed85134c3f60bffd SHA-1: 8c39e24360c9a7cd169cefffc0bf9ddc45fd4f61 SHA-256: 8297bb69abb9d1b5f16955bf0cead3964dcc852d4ce51beabf9c2290dfb9cb8c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://okna-kurska.ru/page_edit/_samples/userfiles/files/zetuperigoj.pdf In PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/4306e1e33413969274ff80b6fe9742bd/75804236247.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c96b200c2b---17716791356.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/s5d19riq2ku2on87grin8r1nj8/43688866125.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/40430677608.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/98317938100.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/taxuvefebojukabelalivuwet.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/mozinovusaf.pdfIn PDF document text
    • http://myphamasia.net/upload/files/sutediguvuwiv.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/kuxefuji.pdfIn PDF document text
    • http://asfalon.com/__files/file/22876701976.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/7222717e1efe5328a9b7b42f27f4ebf0/20189973437.pdfIn PDF document text
    • https://digireg.es/upload/bemanoke.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7a6393e86ff22731698bb14a5e96e9ac/pijupagud.pdfIn PDF document text
    • https://unitjaya.com/contents//files/vubosuwagaxuked.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/dutemuvagipiwevabugegis.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/purgasutkjq8b46us52brqdtjc/72545773345.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/bemerotivubokevenire.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/zijekidupemaxup.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/juzuzuvegozi.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/10371524064.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/gmfnk7rblj5uu7l55pqcarniqa/kiwulozala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=insert+code+in+confluencePDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/7815821632.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_off0000bfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC2 10356 bytes
SHA-256: c3c7614e985139dec0c932485c1c5df014fa267bed3ca2e01ee98328e4bd97f8
font_01_sfnt_off0000d742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD742 16776 bytes
SHA-256: 10247b2209c15402602e63fee320ba59ea3180b52938d16296ad1aa9f92a0317
font_02_sfnt_off000102e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1