Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b60b31308c9eb0…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 00:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af2645e1332392b83ee75aac7257f1af SHA-1: 8561240b51402738d3857922dfa31326fbf2153a SHA-256: e4b60b31308c9eb0786f5338d85171206fbbd59e9b082b0eb3945150ec35e42b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=genetica+de+los+grupos+sanguineos+pdf PDF link annotation
    • https://art-gallery.mn/uploads/files/10199759858.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d5676ba67d162d4229f3bbd7140e647a/89859140375.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/pokopuganawipujogimorom.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/fdp3h5kik1gv8sr1j8hr2q2qna/84810728764.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0726df542---73010405330.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/48773106597.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/larezifekofijuviwugoj.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc87ead24b---bovojetopovesimuwimozub.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210611035606.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/55821626693.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6952050b90---6017622073.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/cbba41fbc3c8d2c7f6f883778667a26b/tejozuvijuredolawevubaxa.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/merovefanukuxesimareka.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45c22eb3f---54029238742.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3102a615d9---79183425038.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b9a8973dc41079eb4f0f47796ac2cb60/fakudukobuwijutofavila.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/56717530982.pdfIn PDF document text
    • https://digireg.cz/upload/14538495296.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d30e68bae---doxupefutitunofuki.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/powijumubefejoduzajawar.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b58404c0211---dusulujupu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0e0b8b9225d7e45bc8942e5d4fbe19f4/nopab.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/7091acf46da3383507f7a6c2c794aff6/54229604849.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/nidukoboxojabapaxagib.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/7402151955.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_off0000b875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB875 15832 bytes
SHA-256: 3bbb3003c4c9226526b46b8e885e9c191f7d00d7b6b6dae15906fa9dd3982b12
font_01_sfnt_off0000dfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 10936 bytes
SHA-256: 05bef9f3f896f49426feeb9ef0c37a8cbb6e9dd3c0d46051d4cbc3c7e218f906
font_02_sfnt_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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