Malicious PDF — malware analysis report

Static analysis result for SHA-256 190cf241bfb0792a…

MALICIOUS

PDF

86.1 KB Created: 2021-09-03 19:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a36ada8c8ce8655303d078fdff678e7c SHA-1: 214f0864804abfac5ef4d3cea360b05903a79959 SHA-256: 190cf241bfb0792ad6d9e998339755b13f3d507b2e35261ec486eb1ed35bd0ee
164 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a download button lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://westmont1970.com/clients/1/1d/1d0046bffbd1a03ca32bb02538d2ceaa/File/28412513768.pdf In PDF document text
    • http://maydemtienvn.com/upload/files/gapikepezepar.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/goxurobotin.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609925e8d8c58---dajivezozifo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2949d0d13---48913630114.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/doxesajid.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/11800307432.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/f2u61dc6hb0av70g9tm3ie6ogi/tukunon.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707f037583c---49393448679.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/puzixelubofiw.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/warodaw.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701d35d6c97---41148700830.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071bee2e9708---kidapapafozegasezisebora.pdfIn PDF document text
    • http://bdaudit.ro/userfiles/file/88818525195.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/89501760327.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/8a3a3065d3b6b4b994607c437288d28e/95387258510.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/hsihe4ldqcujifs09g5jj63i8d/61130829001.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/korexab.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1068db3149---3381996703.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/548264471.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa6dd6c37da---4914783125.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/028bfe0d8e7d1ddb593fd9e6b664850f/2581616492.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/galomegibakodiz.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610799c9f3c25---35279353866.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/90248243157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=family+tree+in+french+worksheetPDF 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_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 18996 bytes
SHA-256: 227aed22d5912c54d7b04816590a5cd6fbc43507c87e4369c1138b9523d4115d
font_02_sfnt_off0001324c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324C 10868 bytes
SHA-256: c8be59773cdfaa3da6f008cf00f8f0d212de3fc55cc4c38a680d4b43b4d58a6e