Malicious PDF — malware analysis report

Static analysis result for SHA-256 584f9a38ca002979…

MALICIOUS

PDF

88.3 KB Created: 2021-09-20 16:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: feb7b96ec153f8f08400b9d50a9c652f SHA-1: 124678e5ba6cddd114198c914cc7e61fa8123ecb SHA-256: 584f9a38ca00297977e05ea589f4bef900f608a8b53afcd8b99294263384a8f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=make+space+bar+bigger+android PDF link annotation
    • https://lasanisports.com/files/sifodujazizexitok.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/397351651.pdfIn PDF document text
    • https://yifff.se/userfiles/file/dexadivadifuvojozopifam.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/63630348038.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/64672358364.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/75657213678.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/85679374439.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/fomuwaxisovevikiromijivus.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/gusip.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/11bc015dafb420ea941dece6504d7a0a/14630908534.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/21522142522.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16308894572535.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/06dece5a2dcbde5638ceffd25ab70750/15864995464.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/danewotegef.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/memuxalipini.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea84b09ad3---limezovedigu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e32a85b38777b45d2325ae987d741c9a/lufuje.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/64305843803.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/fiwilo.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/gevuvawixofawi.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/93041188107.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/66795830167.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/99628804897.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_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 10772 bytes
SHA-256: 39fab38aafda0e1a7fcb322f68f6a2ab27253f5150a8a40325f6f6afa7296509
font_01_sfnt_off00010cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEC 17796 bytes
SHA-256: 8b4ec31caf43843fe5655dfd713408a2dd0b90fe00a9a52e97ac75256c2aea99
font_02_sfnt_off00013b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.