Malicious PDF — malware analysis report

Static analysis result for SHA-256 49581e77aa6d7370…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 06:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7350a839e615a5f0759a3f905a9f73f SHA-1: 21ad7aa4207ff72e6a34f57eb708511721d58646 SHA-256: 49581e77aa6d7370783a2390b02d96b9fd8318325d517bcd59ff2ee6f694efc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or engage in SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kaitosushisb.com/uploads/files/95914266393.pdf
    • http://queenart.kr/userData/board/file/tovorepofek.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/51b358ba5fea27942134e13dc1f881f6/rivawadugiga.pdf
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210902195929.pdf
    • https://wonwon.taipei/photo/file/dabepidajiwevo.pdf
    • http://to-kajihan.net/js/upload/files/wedumejajalejozezugak.pdf
    • https://xn--atpta-nfb.lv/images/userfiles/files/zenapawunuzemubojug.pdf
    • http://stjconsulting.it/userfiles/files/pibabaxajunonunipiwikagi.pdf
    • http://yujinpharma.com/upload/files/xajuvofabeguw.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e7c0ddbdb4e97d1d8d43a6c6fe26b802/48715644806.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413ab1110ea---getirema.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f1efb030370066c384259c7b1f06d300/nepaf.pdf
    • http://www.santamyoga.be/images/file/9912242680.pdf
    • http://seyrimerdin.com/userfiles/file/runipodafetiwexokub.pdf
    • http://wxhsbl.com/ckfinder/userfiles/files/20210904_072151.pdf
    • https://zemtechnika.lt/public/site/0files/kululokiwuloweg.pdf
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/tizivufezuvugusafikajun.pdf
    • http://lex.tj/img/file/2177379888.pdf
    • https://sreekanakananda.com/ckfinder/userfiles/files/93242198550.pdf
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/36781747770.pdf
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/mepomelazawebe.pdf
    • https://macauroommate.com/ckfinder/userfiles/files/revarokawawinogakamejigef.pdf
    • https://felicitareonline.ro/ckfinder/userfiles/files/dizosiroludekel.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a42fb128b---75536604471.pdf
    • http://riverside-plaza.com/upload/userfile/files/38238761017.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=romantic+books+to+read+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000debd.bin
4b4d03d99efd36eaae0642b8da3b0ca83b56abdd0793047b463b1ec57b4a1964
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 10808 bytes
font_01_sfnt_off0000f7ab.bin
78e66e01030d96e7caf8e7bc89b6264901a0fb1c15da5d35b3261b4c1af440d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 17512 bytes
font_02_sfnt_off00012521.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12521 16792 bytes