Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b633ee3d24278e5…

MALICIOUS

PDF

70.2 KB Created: 2021-09-01 04:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc11a967ce3958d6a88f6cfcf3f12b90 SHA-1: a25021fa3e404166cb2a9344a5541edc73b9dd7a SHA-256: 1b633ee3d24278e53ad7257139821c31fc40b5197e03159c3af80fa8b39c2494
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, likely intended to lure users to malicious sites for phishing or malware downloads. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=merge+pdf+page+by+page PDF link annotation
    • http://rund-sro.cz/UserFiles/File/ximomenewiwafawutin.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/vewokezibepedono.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/56773546142.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/joverudivawebemiteg.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/vazirimerudosef.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/32391006670.pdfIn PDF document text
    • http://preiss.at/upload_files/files/pulif.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/gexetipeledozexojoguwewi.pdfIn PDF document text
    • https://digireg.li/upload/birivijililetizetuloda.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/94b7adc1ae61447c5f0e281e42f5360e/46791778077.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/furatetopu.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/majowadosirumupowo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c86d05ceece---95937622075.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/33097111815.pdfIn PDF document text
    • http://babamoleskine.com/files/file/kozijavipukafopemubiru.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/pilulo.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/benasazilegewexoku.pdfIn PDF document text
    • http://aquatherm-graz.at/files/86711722572.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/8f2ca554c4a9fddd23c293bbbfe0216f/gavasuzifunibapezis.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/42642695876.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/85629790687.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/93397458488.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/wudajakemesu.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/nukijuwojoxebukugow.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/23381534462.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB529 15608 bytes
SHA-256: 9c4c2ad7c75f9d0658c3fdb4fdb9c21b1332b26f6bdf2abeba0328462f104fcf
font_01_sfnt_off0000dc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B3 10292 bytes
SHA-256: 1c28dd5b4748ef05d288ece65cfa21c76fb7cc42ea32a8d70b821ece1d9f593a

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