Malicious PDF — malware analysis report

Static analysis result for SHA-256 797cc0f26be0b925…

MALICIOUS

PDF

103.3 KB Created: 2021-06-26 01:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cd715ecfce78845910716c055f8eb360 SHA-1: 92ab6d89f82cfc51d16827e36e3497501dbd469b SHA-256: 797cc0f26be0b925f7d521bbf2fc506c55ccc854719c7125874d5df8dfd6eb47
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on domains that appear to be compromised or disposable. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure and URL patterns suggest this document is part of a link farm designed to manipulate search engine results or distribute malicious payloads via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 5

  • 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://jajugroup.com/ckfinder/userfiles/files/48593607484.pdf In PDF document text
    • https://cambodiadriverservice.com/userfiles/file/popiwubunatomajugoxati.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609807c2ef416---42433837940.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160706b8c955a5---93506420723.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/21c01bac9de9768b2216b344e3f9120e/jomoragimedugipebu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609063a4e0fd8---tapilobiwipafunorixi.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/vewum.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/8r630lj0tfvv134695r16gpkph/dusimibumawugejon.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086afbcc9b0f---gezaxixubimufivonix.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be10b1501e6---28176596736.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///buvugitedofenino.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/46746942017.pdfIn PDF document text
    • https://silverwayshipping.com/userfiles/file/fejajawelixixufunusip.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609465238f680---27023809718.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7129d846b---25627420182.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896179863d2---baborebikelorafaxopam.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c140fece1e4---sovuwofuvef.pdfIn PDF document text
    • http://adveotec.com/img/file/85688951130.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c406aa4309---basegazexopadebunom.pdfIn PDF document text
    • http://web68s.com/upload/files/zumewotisu.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d6786276d---timawal.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072a3f839d7c---jeridumawikobapotikirebet.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/84bvqs6014pbjh94u2d3b3isk8/tewutirik.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/44243252347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=why+should+we+hire+you+answers+yahooPDF 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_off00012e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7C 19328 bytes
SHA-256: 26514ce1f03f15ce673d87c3fb81528962ec19317e93234522b113e77f5f54f4
font_01_sfnt_off00015fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FDB 10540 bytes
SHA-256: 6c9474b06bd43fa0d3d6c05e1738720c37ae21d8cdb39cb1ef96d55984da3aba
font_02_sfnt_off000177d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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