Malicious PDF — malware analysis report

Static analysis result for SHA-256 166c1e1a2e177f06…

MALICIOUS

PDF

85.3 KB Created: 2021-09-04 19:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4b7bf1ed1b4b62fd2fca09d6bf7dd3e7 SHA-1: 814736f5310b8a0c56f72ac56af3011d2f4fffe3 SHA-256: 166c1e1a2e177f062a6e5a401f809f837511e75fcfb7d121df1e0035bdf870bd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or use disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. While no scripts were extracted, the structure and URL distribution suggest a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://goldcoil.com/uploadfiles/files/sowujexufeda.pdf In PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/78432699969.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160735e458cdb7---91329080373.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/34188949520.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210621_958A57D1EA770364.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/69ee3f68c14bda8c5e71790de62eb8bf/takegerukuzafulopilamom.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/44444018905.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/bevagiwinanabugoxatox.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608249a490e3b---topasevezetefizexurezagu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb1d9aa440980338ebd08aaa30dcf3b2/vileti.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/10932492048.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084935077a74---gidakaguwedosividofuzopup.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/4084703579.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/85693134166.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/55466442091.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/63183293562.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/mot62c2l88fnoh26ugmu1bmc7s/14167266578.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/40059863671.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abeebf68eb6---12967768009.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/95319949.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/zemejivuginijaxes.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/0a9fc63063c7dbbdaf2d1409b81f047b/nixato.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076b94007a56---xedumalotodalizuzaresu.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vovarojixefowore.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/765dd4d0ad741ff775fbeb18ee972a1b/57864069345.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5b84f815---bukekode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=solid+state+chemistry+class+12+questions+pdfPDF 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_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 11492 bytes
SHA-256: f6c1fe8ced223b8f11c9befdcee85ddfa6408d628084ee8644c7ab4246e3cc96
font_02_sfnt_off00011808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11808 18312 bytes
SHA-256: fe2dafea1d3df2f29f37548fe19337c380ffb28b6e9549bebbb0a25fcb01c64a

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