Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cea03ee7814755f…

MALICIOUS

PDF

86.6 KB Created: 2021-07-22 23:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 730688c6b67a5074c72b8842bb03b957 SHA-1: b1589cd85ebf205bb24f7eed6b2b2e878bcdca9f SHA-256: 2cea03ee7814755fbbe96876a8f8c3a782886dcbea573f8ff15e97c413fce2da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085ad12ec896---14394633373.pdf In PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/vojin.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/wuritewo.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/19ebf3819406984008aed0c616f5da9c/labigoxejemulo.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/79420826678.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/60999006351.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071da0525f86---74109435945.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a238cfbe5da3aa74efb2269ae816f876/tajogiduwinu.pdfIn PDF document text
    • http://scro.ru/pic/file/diworidatukosi.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/19c1511394e9887ce9f4243d2bac6802/77344865208.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b981f71a779---82635207258.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cf5c94340---22115310245.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210628114843_539763.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/lulererupadubivo.pdfIn PDF document text
    • http://acgroupenterprise.com/userfiles/file/tejamowoguwobizokev.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/19e47f321a2e30c95c4d14c1accf5798/vuwejirewozoxamusegeruza.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/64609953620.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/siviwasotabosazup.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/50442806029.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/77240835928.pdfIn PDF document text
    • https://energooptima.hu/upload/File/19323513521.pdfIn PDF document text
    • https://electroagro.es/pub/files/6876822235.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tiredamenalax.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8faae1037a---xugupemesitojero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+invincible+iron+man+full+movie+englishPDF 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_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 10952 bytes
SHA-256: dca39e2443971d2fdf69e84b27b9b4f67bc56c82b8d6eb42622dfad00b73bcfc
font_01_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 16600 bytes
SHA-256: 79e45c74a83d3b8c3361b221c1729f0a681f2be12a6f55c39d95bcce075560d1
font_02_sfnt_off00013470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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