Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdbf5f48526402a…

MALICIOUS

PDF

77.0 KB Created: 2021-09-02 01:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 189401d89dad457f853338d0bedecf14 SHA-1: b9e827d68f8faeb70a186fa2bc4501c2ed22217f SHA-256: cfdbf5f48526402a8dca516a948da37287a0ff371dfcaa22194d643ba7f4a8e0
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://abwcoliseum.com/uploads/files/44400671172.pdf In PDF document text
    • https://rumusjitu.com/contents/files/ximasalufozufigidu.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/69457042295.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/38250231564.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24faa061b2---newatakigavivufiropitu.pdfIn PDF document text
    • https://hsse.cl/files/28331586428.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f996f33275---51204752069.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/43904356859.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/xibitop.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/wizijitopikunulaxa.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/renezanafanenu.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/38337276992.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6bf51a64f0d3f5667a22b62e6bcf3d54/xasilolutezilutexosafeni.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/vqcjit58bupqm35f4sjtil63qj/46061079741.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/70836988912.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/45790078262.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/96935462530.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/danijipogemudaxokufa.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/crdd60o9p8parjml5cah593nj4/dewapubasopusomug.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9155990d87021afed7ea5dc431beda78/942777457.pdfIn PDF document text
    • https://agatanorek.com/files/file/6557494331.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e540a64b0d8---74355295171.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/xobelu.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/54cc01c6aba8b890002ba08fca7bb8c1/riturijejigemabimigovepe.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/vijonip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=class+1+table+worksheetPDF 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_off0000cc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0A 16656 bytes
SHA-256: 497ee242e6f6ab756cee91646096621d83309c9a41b2f266609b949f3c934f51
font_01_sfnt_off0000f68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 10408 bytes
SHA-256: 2d3912726093c23eeb94b1c7df51e142617e944ed2aefd4bd00e276a2d27a5f2

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