Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bdffa76c599ca26…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 12:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 793495eb9b62abfc7d48869275262665 SHA-1: 72840ef3e0bd12e60da2ed10479fc35d99fb2d65 SHA-256: 9bdffa76c599ca26aef3743f16bc20b2bcf941e92678bb071090f2347ee7174d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using non-clustered, disposable hosting for a large number of links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210921154835.pdf
    • http://ablerexthailand.com/userfiles/files/tanurorupuzefenider.pdf
    • http://embeddedhr.com/ckfinder/userfiles/files/zozirumidaduxixabuvor.pdf
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/tovaxaxubasi.pdf
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/18593552391.pdf
    • https://sandp-engineering.com/ckfinder/userfiles/files/ladizegigazifabene.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613378e8e25e2---33187349518.pdf
    • http://gusanhightec.com/userData/board/file/45494876722.pdf
    • http://sys-svinding.dk/userfiles/file/32148065468.pdf
    • https://vannordenvastgoed.nl/userfiles/file/73572434065.pdf
    • https://mayphoviet.com/media/ftp/file/13761435697.pdf
    • http://wideanglepackaging.com/ckfinder/userfiles/files/37642398498.pdf
    • https://maintogelonline2.org/contents/files/7076906106.pdf
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/wazaneloxi.pdf
    • https://cissud.eu/uploads/ck_editor/files/nabufutetilokow.pdf
    • https://pellevah.com/upload/files/74032469856.pdf
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/89411866121.pdf
    • http://farmaciafoglia.eu/userfiles/files/vefubexuvotagizexi.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/lifoderebikosavozuxibaxox.pdf
    • https://rainbowfurnitures.com/files/files/jedogexubezivo.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141912ab639e---51877312914.pdf
    • https://habibitours.com/ckfinder/userfiles/files/nexelenenoliwo.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1614298e5c14f9---73255299368.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d722bd1c45---fufagukoxujemiga.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=watch+50+shades+darker+123
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D6 16792 bytes
font_01_sfnt_off0000c9ed.bin
fe6ba18d9ad93bd7e0790b32126f720c02c36f3e02043485df773ed1d66794c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9ED 10788 bytes
font_02_sfnt_off0000e32e.bin
2868fd39fb71afb352005434cd3ac632ceca87ef4f08c63dde082118a95e9386
pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 16956 bytes