Malicious PDF — malware analysis report

Static analysis result for SHA-256 71998997c8f89f41…

MALICIOUS

PDF

89.8 KB Created: 2021-06-26 03:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82ad7de4e5e6ee06d5b7ec598a451368 SHA-1: e2fac92f7c8a82a2dd429f47eb53f710ca2c564a SHA-256: 71998997c8f89f419558120f23b94207621580393d4fce31ada1c75474da123a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple external PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • 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://accessprecision.com/userfiles/file/69108567736.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/d8ae9a6ec7403dd8555ea389d72b2a1d/55842479763.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6ba69fad2---49992966790.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0962840e9f---faraxoxon.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fd305fadb---94975881775.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf395043998---58811992479.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071979759c4e---mowabasemakefufazubir.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e6ae986b9a7eac73916144fb392f54f2/vunubutirefarepi.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b365de8c75---44700144510.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9c03dfa4---25694827005.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/3f4000c0049349ed2d3d5aad0296b7d0/35342990691.pdf
    • https://arvikabc.com/images/uploadedimages/file/52896855533.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3br819pggr5lgn0fgqe91vl7g7/11382211988.pdf
    • http://marathon-gexin.com/Uploadfiles/files/37020827235.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/2023167594.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608956ce9c4c1---67039904163.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1056ce998b---67955975017.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/96a70b9e2c76cb4e6fd28275bea6aee8/jegax.pdf
    • http://congtydaihai.com/upload/files/wuzeninobibegudu.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a8309be3fd28c8838d91999e75614a8d/2199107675.pdf
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/3983947069.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d04c1ce60ae---kumofimodajanufewadawaxud.pdf
    • http://hakkabrothers.com/userfiles/file///95115238431.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/dcsdfv4f1cskfmt962228cg35r/biviwowixegiwuxud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=simple+hair+cutting+style+boy+image
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9419dbe87ad4e1c16e8995ff11d87739/56649591835.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EA 16792 bytes
font_01_sfnt_off0000fe01.bin
e47cccaba2b1f88a7cb0cabfb852fa4a2157c4e06f8f4279e3011362bbe27b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 11252 bytes
font_02_sfnt_off000117f8.bin
0761d5f824080a34b601324bb329c6e3d315e11cd2ff30ad2c190a51f430a5bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 16872 bytes
font_03_sfnt_off00013052.bin
1610b3004172fcc73765278dd2d9ee4e31b29b56e0598616b8f7b02208059dac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13052 15840 bytes

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