Malicious PDF — malware analysis report

Static analysis result for SHA-256 18188a337dbc0285…

MALICIOUS

PDF

95.4 KB Created: 2021-09-03 00:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 843eb4548a4bc08d11e2a850a570e0d0 SHA-1: 2e9dd8858cbfdb51dc83f10a13b568ce94bacedc SHA-256: 18188a337dbc028514229b3228c77b170cc7260f7a4cc4cce862cb8b820751de
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://abofahed.com/userfiles/file/vaposuxijezarilavufike.pdf In PDF document text
    • http://www.cbs-emballages.com/upload/file/pisepepadugosekexukukinab.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0296798001624582250.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/elb2tfo82s2lvvlolq5uqj54nj/62394067551.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/cb278b928aace087a1874908748b6f13/senazedilulul.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089ab5f51987---dexenuvibuzofilitozaf.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070bcb5e9bc0---23125146307.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc85ae45df---wugip.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6o6odqjlcf1n1q56hf860isjl3/65518555359.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6543f5f5f4---seredozodibefibetivavu.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/a07d6e4b33e041b4db6fc8f3ddef8780/42683707778.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/b2181d252ae7fdd82342cd4c1d42d7ce/bubozowovomanudaxej.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/9m7rcekmis9g5mqm4435jhria7/voxiwirarolelabenokosiwo.pdfIn PDF document text
    • http://ipublicity.cz/data/file/gazobedoripipeto.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/doxepo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/fapenekisevole.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/vetibu.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/72072145524.pdfIn PDF document text
    • http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/68541953431.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/rifimamekorore.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/cda2271d65d8814d67bad3c0734f5e9b/91163271750.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/17151680236.pdfIn PDF document text
    • http://ropesadventure.com/d/files/49675162440.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/rowadufumuw.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/10393646791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ejercicios+resueltos+de+fisica+1+cinematica+pdfPDF 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_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 20504 bytes
SHA-256: 6429205e1641722200e5f4ef2ec0ae3fcce2a466c2319623f67f1f0e6d2628bd
font_01_sfnt_off00013db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D0 11048 bytes
SHA-256: 6c0e612624e7ed1df1437171856746b6fb28a3187dc00421309e5d1361b0750e