Malicious PDF — malware analysis report

Static analysis result for SHA-256 8882ad1ef948a09c…

MALICIOUS

PDF

86.1 KB Created: 2021-07-23 00:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59f2350170b715659da1103338d0fdf4 SHA-1: 7ce43d9a93edc2afff668d56aca10f0346fa5413 SHA-256: 8882ad1ef948a09cfbf1f80b26896983888cd99f03fdca38e5d9ed69e5d3fac2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also functions as a link farm, directing users to multiple compromised WordPress sites hosting further malicious PDF files. This indicates a multi-stage attack designed to deliver a payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2bedccb252dccd84b2ae689a8d0edf63/59452766140.pdf In PDF document text
    • http://lebo1977.com/clients/7/7f/7f96701a3ad848a090446b6ea7dc17b1/File/razowevelebosofoko.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/hsruc1jdurdb7ghab3qsrlpoqj/jiwuvapirosegawajidako.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e05cf1bb98---tejawuwarejufaporekusovip.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/kj5tf17ais1cn078mbbe1aj34i/41874913680.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/pawaj.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///69955004155.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/zagatop.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a984f2e716c---xezugesim.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0665a65e2dda7b115f691112169ae74b/64288248437.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a4c43fd179f0f7b2b4af89b576bcc30b/bepev.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/joguzewosoja.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0402c93d2---ramugebeseregusuvareti.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/56752737476.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/xubufopesopuvo.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/xaxivu.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/46176087056.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/sasitotin.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/10863920164.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/14370422417.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1e3aa737f0f33f4d749d6ae4fe134cb6/90918285204.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/53234513193.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/qt2bon3npspj2a9ec4m5882q32/79882323570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=example+of+positive+statement+and+normative+statementPDF 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_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 17268 bytes
SHA-256: fe2290170c69d6593d2b2fc61c6d377f93c83fc3073b573a07b17d5858af748c
font_01_sfnt_off0001195e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195E 10812 bytes
SHA-256: b3e9d2874fd7ff9df5da0b839c29af265b1147da2c2a0779f7988145cff90723
font_02_sfnt_off0001324b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1