Malicious PDF — malware analysis report

Static analysis result for SHA-256 8310b16bb2eeee6d…

MALICIOUS

PDF

83.5 KB Created: 2021-06-30 04:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d566f89250ea3afb1a6f374bac7ce4b9 SHA-1: 4bd8131149febe01d232f859ed1d9523ab29696a SHA-256: 8310b16bb2eeee6da922ccefd642b159d53588df128ff0528e8c5ec3871ed48a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The primary attack pattern involves redirecting users through these links, likely to phishing pages or to download further malicious content. No scripts were extracted, but the presence of numerous external URIs and the overall structure suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=ff8+official+strategy+guide+pdf PDF link annotation
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/2s60f6ungtoh1lar43rua3d4m2/15642445709.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/26r3ihueu514ffgp8iiv31o6u5/xuvezilopibepexupap.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/74383027725.pdfIn PDF document text
    • http://tkvolley.pl/upload/files/zifofu.pdfIn PDF document text
    • http://cl-pub.com/files/files/83906004472.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/df2d0fbe33e7cf2c83997b26e4fc2c14/gexezivuzibamaruvu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/83af72e4043f6f83e92b7da4bc6d814d/lojuvidu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/5133dd13445ef673ba729715384919d8/14691983945.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/f3931157a0871925294de8364bfadc8d/pupanakofozigudibebe.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9f9f442c8---gikibi.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/tosasatufelof.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/6796a4db6249221b03f2bd4a483c2e5a/17906765498.pdfIn PDF document text
    • http://islandpointfl.com/userimages/86739297990.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/p9chd42eqqdqf0fnrp327c5ju4/35211974696.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160993c54e9c77---wulozibexakemokoperulus.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/99073823952.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/xikasokapa.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6d5b17b4c24a1cf107f8ed1e229287ee/10615011092.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/mulotuxuxepogatuwuxikepa.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210619050734.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/2jtpbm2ebjh08f9s6kmdhtsf8a/tikajemirijuvopubas.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/ledazagevenumobobapug.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/wesororajuzaxako.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c951472d1f4---81733534605.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_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 11088 bytes
SHA-256: 13a8d8b4be2e97cffa55e545d4d6b6c9425db10b66533330fcc84d8889146509
font_01_sfnt_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 17912 bytes
SHA-256: 123daf796db6056407ba70e4a16b024f922522bfbd6adac7297d5d9ed1908d1f

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