Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec5ea4c6129b668…

MALICIOUS

PDF

74.1 KB Created: 2021-09-11 14:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a83bece15bb1a6075c16069acf6750e0 SHA-1: a5de8ce3473caa87ab52e17c83cde0f5711ba2e3 SHA-256: cec5ea4c6129b66837f89d5c71b04075f04fb2a90674b15643ababaaf6348894
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://connect-event.fr/ckfinder/userfiles/files/tepekotinarurum.pdf In PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/lujabomizimopiri.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/71178130351.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132e03dcbb28---28875584546.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/87875614973.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/87254434822.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/metaxa.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/kuvinagosujemame.pdfIn PDF document text
    • http://www.heksan.com.pl/file/xunatoba.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/zigusav.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/29896186633.pdfIn PDF document text
    • https://cian.hr/userfiles/file/solekobokokerubus.pdfIn PDF document text
    • http://devveb.net/userfiles/file/nixeniji.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/fa4cda60e4e7596a0ca56493a60e0164/rofobadeluzebuva.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/85692207721.pdfIn PDF document text
    • http://ccadl.com/files/20210904160419.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/12926548125.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/5806958710.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/57908302095.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/gutevojuji.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/xekigag.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9d6f2770---9618154983.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/33557999140.pdfIn PDF document text
    • http://mweb.cz/images/file/90124218431.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/98c2e03b6bc1baafb54c20e10db84a3e/15106286727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cool+fonts+generator+copy+and+pastePDF 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_off0000be8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 16380 bytes
SHA-256: 582a19eaa8404b5e3d691074edbe2cef7e30d2634941e184e42d725aef3b5661
font_02_sfnt_off00010107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 10848 bytes
SHA-256: 824027bae92b2d7c191f9c21b8159074b334d186cdc5eb91cd9dd860bd8cb855