Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ac3eb7fb32463a…

MALICIOUS

PDF

86.7 KB Created: 2021-08-24 02:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a9358ebded9682db2a4c6dbc217df2e5 SHA-1: ed6c7a3d018888961f765fdb81c3ea995b49c64e SHA-256: 70ac3eb7fb32463a20880c0d823a35a9b330d8eb4a629c73ecd7d3d1c4181b9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting a phishing or redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attack that likely leads to further malicious content or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=i+love+the+things+you+hate+about+yourself PDF link annotation
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a89f5adbfe3---96842998771.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608de3c4c4617---24315392192.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/68608042082.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160abb262425ed---59667488704.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a232cd03a4d---62894004760.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/vedetefefituxopimenob.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/93987ef67793082e0a734bf2b1967338/jodozula.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/rarepofon.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/6v04cke12t65viflm09g23iss0/50402403003.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/nibosiwusejifeduvugelen.pdfIn PDF document text
    • http://ibb-online.ru/f/file/wojegabevuwab.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/mcs71cdgkbua19223c8kqtg1te/96739074079.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/99733705891.pdfIn PDF document text
    • http://linker-apps.com/files/xivosijaluvozabobira.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/b97294b81e947f5bc5e0da5003a58b3c/miliderupasulagoseg.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/40427880017.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dee5cbcad61---kokuvuvito.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/bexomapasimosedutilemi.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/vasotivixuwojolemetarumes.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/12279363089.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/71849225080.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/716a0bc1014c71d8ffc5b330055bfabe/magebamipogefabixuxarodes.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/mupejegin.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/22603441630.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/wunatunipumub.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_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 10864 bytes
SHA-256: 98748272b8e8203995bd6427e0971f3d3a0df51f37f5124e145cce000e2a9c73
font_02_sfnt_off00011ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 17912 bytes
SHA-256: 92811c07c407e94f9427043386978644b1066049c621aeed06709e2fda639554

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