Malicious PDF — malware analysis report

Static analysis result for SHA-256 961ecfe707a661dc…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 14:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5eca20e81b8a367caa70b7c2acdfb3ea SHA-1: 391df9ddc32d9659cf6f34a7fd4626e5c00829df SHA-256: 961ecfe707a661dc47d6fa2c72948ab2f871cc537a8edf7e8d32bc14400e4ae7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://binarbaidequipment.com/public_html/userfiles/file/bokukulekinijixozigu.pdf In PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/wemuwijikijowabari.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/12751201999.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/13875399672.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/5178098565.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/sigilajinugapabusozafi.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/79990598885.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/49160282909.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/dolumiruwelagijubutorub.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/65eb14e53bdae1a33504179bbfcb983a/fefapaxadewudurikena.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/bavodewaje.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161312e5c4c85d---vepuzadudupudow.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/jejaja.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/37843199778.pdfIn PDF document text
    • http://w-mill.jp/images/file/nibisiganobona.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210906_023249.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/mevubaxagosunediveb.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/92256588657.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/wutasakodavo.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/davarizoki.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/33198954570.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d1807825bfccef0cd2861ea4d8d235a1/65237245942.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/vejagarafezeguzedu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614496690935b---77549562993.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/dodegidase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=merry+go+round+of+life+violin+sheetPDF 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_off0000e401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE401 10744 bytes
SHA-256: 8b23f60e39e3c67a3d3526341301d9dbb449c075e0921df4e7f5de190e585f81
font_01_sfnt_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 18764 bytes
SHA-256: 1a6f0e1012bd639b6109c94216e01331a681389b7041b3071208de5abd76cfb6
font_02_sfnt_off00012e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1