Malicious PDF — malware analysis report

Static analysis result for SHA-256 e583b08a547777e3…

MALICIOUS

PDF

87.4 KB Created: 2021-06-30 11:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44bca85beecc7de8ae839327c9d5543a SHA-1: 08c22e340ff36ccbaac8b9e8b2561c028d0e4258 SHA-256: e583b08a547777e3c5401bf623a50c294d352e28a3bd111be971506dae0d0aa5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm that points to multiple websites, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077c63a35713---diponivurubinurewokedozu.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/e33e025cb61c1cf4f3e60d2e7fae7271/97652388809.pdf
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/poxot.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/pepfresov1vmnlubb2afrm7nt3/92772667367.pdf
    • https://mangonebike.com/uploads/file/jaligadewoberad.pdf
    • https://cafe-malaysia.com/contents/file/62947806318.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609733484fd2b---64949130377.pdf
    • https://fallsplat.se/file/sududedi.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/5fbf91b973867c34e850911194652756/49425229611.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b276db7faa---60984472010.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079c3bb47086---bulujapawulamivemajugag.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16097a94f0d614---91763044365.pdf
    • http://studiotecnicopinto.it/userfiles/files/vobexenizofotus.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7f8c54f82b5cd9e17f9beffdff08148b/39862492002.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/359a3c289dfdd27b3797449756615251/junezed.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/eae29d4e7ca9b25e95d00a9597752f7a/45585895125.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5710dc065b---pilobijizoka.pdf
    • http://portalcom-b2b.es/img/user///file/_0471511001619964698.pdf
    • http://richardchong.com/userfiles/files/32250574974.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9682701abb---57432546010.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607936bc34473---revevosijinivuwusokuzawiz.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970590408d9---88168546498.pdf
    • http://nail-free.com/ckfinder/userfiles/files/dikowufetafigox.pdf
    • http://www.77ice.com/upload/files/45164103531.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/31fmekf2e7bk4frjdcm75ckf3h/janezewukikejoruz.pdf
    • http://pphu-joanna.pl/fckpliki/file/suzurike.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c5f486b52---feloz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=answer+this+math+problem
    • 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_off0000f1a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 16792 bytes
font_01_sfnt_off000109b5.bin
4e8248801e86d3cce965dffbbe0f0e14a47b9dc9742dd5a99e4035a9e2652731		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 17608 bytes
font_02_sfnt_off000137e2.bin
b5e1d15b9fa61111367d87c7f056ffe49c1ac691a8f6aa52151afdaf300cc2fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137E2 10724 bytes

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