Malicious PDF — malware analysis report

Static analysis result for SHA-256 45af424685e00c61…

MALICIOUS

PDF

85.7 KB Created: 2021-09-20 19:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cdc5eee10cac46424db0b9e78b76580 SHA-1: a46354ad111e7d1795c25c2d7599dbf1d3b59785 SHA-256: 45af424685e00c610a14b5aae6c94dd60acbadc391b232422a74a0b1d8860dbe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. Heuristics indicate these links are intended to lead users to compromised websites or potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=voice+control+kodi
    • http://zaun-produzent.de/userfiles/file/33248737166.pdf
    • https://easresidence.ro/app/webroot/files/userfiles/files/21506096478.pdf
    • http://marjoleintje.nl/include/userfiles/99046575820.pdf
    • http://sjanzee.nl/file/jojolumutetuwilifaj.pdf
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/10882440486.pdf
    • http://joyearland.com/ckfinder/userfiles/files/85493435150.pdf
    • http://ciccioinpentola.com/userfiles/files/97907959350.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3980b266---63886700722.pdf
    • https://hotelite.in/userfiles/file/kefumileveposiremitopano.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/gidarojexipo.pdf
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/zeresanipugitalagifetefu.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b865b32293---wapetulekezet.pdf
    • http://win-sonic.com/ck_imgs/files/xobis.pdf
    • http://budoprojekt.eu/obrazy/file/buvavexofojigapifegepure.pdf
    • http://nsfeed.com/_UploadFile/Images/file/28907422094.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/urh2efbfbpicqgcbvkhevt73s9/tonofivituvaxerazajar.pdf
    • http://swaminarayangm.org/userfiles/file/27632551205.pdf
    • https://fontan-montag.ru/img/upload/lotaroj.pdf
    • http://citygclub.com/ckupload/files/towawofedukodigenax.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/tlp2be66m8ji3bpl9o9tgo72ar/40476364816.pdf
    • http://hostingureitings.lv/uploads/userfiles/files/bozavidapopisosis.pdf
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/pakanow.pdf
    • https://network-italia.com/file/35403412122.pdf
    • http://alfatreyd-mebel.ru/archive/images/file/jijegekidemu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9a.bin
56b00a9810c47a7872ae4c069cf806e81234b61759e29bab44c9316371efea61
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 18464 bytes
font_01_sfnt_off00011ae0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE0 16792 bytes
font_02_sfnt_off000132f7.bin
2e3636e0d09e2299f64f8cd444a7062cedb0d28fd621dbdabd2a31017dbbc84f
pdf-font-stream PDF embedded font (sfnt) at offset 0x132F7 10092 bytes