Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfcce803e3dd031…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 19:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c0c324cbc0a0d775be46a0b7da0b031 SHA-1: d5551a8f5344d1d2461ea564cef477f92af45325 SHA-256: 9cfcce803e3dd0319f678fd25bd2eaf04cf0e6f56706f43f79231970f449018d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on potentially compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://innobiztour.com/FileData/ckfinder/files/20210905_264E9382928729C6.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614c796d62bcf---67780431636.pdf
    • http://launensia.cz/ckfinder/userfiles/files/18592173786.pdf
    • http://netmutum.com/userfiles/file/tetifikuwubikanukoneba.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143d70383c55---56095602335.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343cd41b675---pivizes.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/iqt2mt4se96f5qagsqkbilpjdv/wiwobolewotekod.pdf
    • http://kdekdyjak.cz/data/senefanakolepon.pdf
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/xuwitagaluloradatamava.pdf
    • http://abwingssuffolk2.com/uploads/files/dudijinosadefaxul.pdf
    • https://fotografski-studio.kost.si/userfiles/file/5255596330.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b903337320---gejajo.pdf
    • http://korio-olsztyn.pl/userfiles/file/98282572323.pdf
    • http://shinhwacar.com/userData/board/file/5432001177.pdf
    • http://babyindex.nl/images/uploads/35645513449.pdf
    • http://taxilitomerice.cz/ckfinder/userfiles/files/96346252927.pdf
    • https://mtdind.aicsmindia.org/ckfinder/userfiles/files/vidojivalapitexesizozojo.pdf
    • http://www.kymkarajok.net/tiedostot/files/75893494107.pdf
    • https://vietrocknet.org/app/webroot/img/files/gajafexamobonujazabiruzit.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d09ecaccb5ecd3013ad76f1f902f73b5/semafivumokubizenarajube.pdf
    • http://kayamedbursa.com/userfiles/file/51260493753.pdf
    • http://nhatminhtrading.vn/app/webroot/uploads/files/85807026692.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/529a7583b3cf3f0a3fc2d0063ee67ff5/gekixowaregetenevinukoju.pdf
    • http://spbmedax.ru/sites/default/files/uploads/38236425064.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=lm+vpn+pro+apk
    • 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_off0000b3dc.bin
8f8c03772108ba8f5113914bb086ffba732bd52a829a2406d53b1cb82142b130
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DC 9992 bytes
font_01_sfnt_off0000c9ea.bin
6fe4b0ef0cee877bfacaa1c3f7fbc65ff2d51a4a47c9738e21742740c654f521
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EA 15480 bytes
font_02_sfnt_off0000f0e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 16792 bytes