Malicious PDF — malware analysis report

Static analysis result for SHA-256 24243d866bcd14d1…

MALICIOUS

PDF

73.0 KB Created: 2021-09-06 01:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e2562cc96d4ee04f4371e9262c3a4926 SHA-1: 99e0e23ef47094b424ae49de827addcd71e0ae2c SHA-256: 24243d866bcd14d122464cdcc89101049cd731b8e82823e2e2ea4d60640f33f5
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • 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.
  • 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://tattica.byespresso.com/app/webroot/files/upload/files/wijevidefolobobi.pdf In PDF document text
    • http://achwvs.love-mrt.com/upload/files/37835437709.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/39094066701.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210523030915.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70873189751.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/fomunozuzobim.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/vipapupu.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/zujibobikovexibiku.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/qf29sb60gn798etk5drs8q9fh1/50558743542.pdfIn PDF document text
    • http://easy-vent.nu/userfiles/file/19341701276.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2769f6b19b57690df0c88527528fadb0/43692856727.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/68148354622.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/16455228665.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/90320927105.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6849eaaf7cc446e5ce95b4d271b8bdf8/26652094225.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/75574646221.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/wufome.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e51e5e51e---72829929487.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/22528739047.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/56072861714.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610bf9aa1597e---4328143238.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/25304505796.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/65160061995.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871a9f27805---56928990184.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/vomikimar.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/46rdakfdsvt28ha086et5534ak/wofomawux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=icse+history+and+civics+class+10+book+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_off0000bbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C4 11252 bytes
SHA-256: 9675b5ef3d831496aa88d9937658c4bda66174e1100862730b5a7312ea67c1f3
font_02_sfnt_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 15676 bytes
SHA-256: 71a17b433abe9a953ca9596c9fd95131206618caad6372f2ef9b8509bc5b3fa8