Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ac7359d2c75955…

MALICIOUS

PDF

80.9 KB Created: 2021-08-27 19:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0b5c4e44a37ffe18341468339ef3f23d SHA-1: 809bfaa12eaca1d525331061cb359fa5ed822ae0 SHA-256: 98ac7359d2c75955bbf6f3ec806883d4fe6bf7fa10ffe45b08488641c644130e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous external URLs, some of which point to compromised WordPress upload directories. The presence of these links suggests an attempt to redirect users to potentially malicious content or phishing sites, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://4bzsoftware.com/Images_upload/files/54734720012.pdf In PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/pivuvewaxegumef.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/biwufotate.pdfIn PDF document text
    • http://medi-sen.com/files/files/toxek.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/sirima.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/31753075283.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/h00568c7jonv79ir73bdd06n75/46650777026.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/40021650273.pdfIn PDF document text
    • http://gptools.net/userfiles/file/53030176951.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab27d18587e---jamow.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b843b32c1---bubekufalexevopitubodag.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080587af2b4f---6753868528.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/soralekusobepepiropimu.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060823482322.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/10636248177.pdfIn PDF document text
    • http://oodow.cn/upload/file/210619202228049236zg3gv7ngho25.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/zesiduditukosefikigolakaf.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/upo0755lnfhrkrrqcn4u28t1sv/86882148776.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210527045804.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8617ed512---14245846881.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/duvukabafanoralasin.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/rajubagutebunefoj.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/019dbaec8252c453a96312cbf881cc87/wujowipukonaxevozasud.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/66275cf2444e0d26833f7c9f5c06341f/vegiput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=turning+chain+for+half+double+crochetPDF 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_off0000d6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 18088 bytes
SHA-256: 08c5d9a88099ccc913d3f8801f864f75516c1daa39431707451309793b3a8f4a
font_01_sfnt_off00010535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 10792 bytes
SHA-256: 492752ff61bb4ff9c284eb8d9ace62ceb96ee31ac70ee217065f60821957770a
font_02_sfnt_off00011dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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