Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b944c790f78598…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 05:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0665c92317d09967dc98e6f05dabde7c SHA-1: 16dbdb5ee05725d32cfc4bf5ecfd79127a19d344 SHA-256: a3b944c790f78598eeb8b86b05edfcb767c59ebbcb46f6929620e18d6280908f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as link farms pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=apps+like+btmono PDF link annotation
    • http://taikenplan.jp/ckfinder/userfiles/files/54294842924.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/56855517555.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/32393065212.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/dirivotamisodabi.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/resumikimetetizuvako.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/boxusuzofomezagisumo.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/jagavegex.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/zoranu.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/besajudasumonef.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631569535.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/83d4d7227d7fd6afc7eea2a8d19b4232/vapiriw.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/2609770675.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/55199552032.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/nuboresixotulorop.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa85d4ef58---benunagewebonixox.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/16484734783.pdfIn PDF document text
    • http://www.ezmoving.com/file/dewaken.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/lunuturomemibopul.pdfIn PDF document text
    • https://sharenkon.com/files/jimifigazefizovexifotu.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/92684812540.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/18512932374.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/83353584182.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/73afce6f854c48b894f66d3844eba4ab/wexazesamejizite.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210908010831.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/36938739352.pdfIn PDF document text
    • 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_off0000e14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14D 10364 bytes
SHA-256: 81be789e254153cf93da4fc73ee63c2be0bff4ae0c7f5ca6f2d15019ca110943
font_01_sfnt_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 17344 bytes
SHA-256: 258c37b7c19f8c549f43e14f3c6a6502d1b46c2766df44f35969e8ace8139baa
font_02_sfnt_off00012587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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