Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb9028c77d11e49…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 04:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e0e1e61a0f1acb162d834043508fa67 SHA-1: fda0eb8685e008d1213a496773bf179d7031f1ef SHA-256: ccb9028c77d11e4930d181ce9086398b33a66bec1e617e104e2399e723989550
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised CMS uploads or disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest malicious content. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://torremaggiore.sitmap.it/files/files/99221717065.pdf
    • http://shriramashramps.org/userfiles/file/pupedojokadub.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/nakisam.pdf
    • http://denis-lefebvre-services.com/fichiers/file/xofifusi.pdf
    • http://tubelessons.net/cms_images/file/47894089964.pdf
    • http://wu-pao.com/upfiles/editor/files/kopilibokoxojaz.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbc0379ef---33430638686.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c991341eeab986464381dd3b06338970/14079230602.pdf
    • http://emblem4home.com/UserFiles/Member/File/nikerexaturedife.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/jubamiwosidinabefeloga.pdf
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/dunivemilijagi.pdf
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/dibepuvodi.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/a74b2520234465f408b6dda045962ca8/najifodetojuzefilekofu.pdf
    • http://thewesternmist.com/userfiles/file/91016014194.pdf
    • http://fli.edu.mn/ckfinder/userfiles/files/ketudasutitekasasupal.pdf
    • http://gabident.pl/local/userfiles/file/35728193768.pdf
    • https://digicpictures.com/downloads/61633462520.pdf
    • http://csaladiegyteruautok.hu/userfiles/files/jetukano.pdf
    • https://cooperspick.com/files/23586547206.pdf
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/22487886666.pdf
    • http://encino.kopanramen.com/uploads/files/20352369396.pdf
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/lufudodibubekisepuxugiji.pdf
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/wapobebijawuvukod.pdf
    • http://shiinamotors.com/js/upload/files/59933605394.pdf
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/24965518611.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dav+class+8+science+book
    • 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_off0000c603.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC603 16792 bytes
font_01_sfnt_off0000de1a.bin
a5d4527cc685161ecce163a25ccee7cf116db7782f146d1347a53d3a4af8012e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 10532 bytes
font_02_sfnt_off0000f63d.bin
1e41820a3a6d5d239bb73b55961f0107ddad04c5aba27126e6524b95e08bccec
pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 17852 bytes