Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ce240cc6851f28…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 21:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ebd3ce48d839905ad9d0ed81e9c29e84 SHA-1: 73f9575db493ca0f077fc428313945e94a351ef4 SHA-256: d1ce240cc6851f286e06dc212459e65f1723a212dfef4bf7fab519ba56ff3369
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URI heuristics further supports its malicious nature. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=13377x+movie+unblock PDF link annotation
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/f7k7jj54j11vs675p04fig2gga/satosakowumufuwijogijuxok.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/94469758682.pdfIn PDF document text
    • http://jfe.hk/userfiles/23340429630.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1795ff1c---bitesovi.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/daraxilolaralireja.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/nodebuzevonuviru.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090620055173499.pdfIn PDF document text
    • http://greenld.com/userfiles/3362830831.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/kotorinuxipuje.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e5a0f4c2343bf26da7ff0e521a1887aa/59408102098.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/tatozelukepexodekulewejut.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/d429i0q76t2v7849b5r2dhfiq5/wikuxalab.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/sagexuwatusape.pdfIn PDF document text
    • https://tranthachcaodanang.thicongmaiche.com/uploads/image/files/kujis.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/78ser7tt1n4a5n9a0eupkdt0h7/vafupurusuzoge.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/65945275121.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/wexexa.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbd960b2a0---85572667816.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/sarazodujaxakinopuzosapux.pdfIn PDF document text
    • https://istanajp.com/contents/files/87671607879.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/33304d91d52df5af5d13f3965cbdf097/miwokazopijasijonowo.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/zenuvijimebexiwoterimuxe.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_off0000ae35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE35 10540 bytes
SHA-256: 56bbd586dcfe111c6efbdcdc98dd3d93d52484ac407f888a1170ac3ff1b9411d
font_01_sfnt_off0000c647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC647 15840 bytes
SHA-256: 2a522d22182c6d2e2149fe69dd1a5dc4a27c29db26019c0671149004e1bd8f4c
font_02_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1