Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b663b1273c5e286…

MALICIOUS

PDF

75.6 KB Created: 2021-07-31 23:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b261a668f1ea4ced4c908f7a2d81bd7 SHA-1: 6b3bcc1dc989f7039c25d70623d39abc1f73da3b SHA-256: 9b663b1273c5e2868f3c5501b4c13a9923a4b37fea20512e5d68937af120d743
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous links to external URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://huntic.ru/uplcv?utm_term=electra+townie+go+owner%27s+manual
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160abca8b66132---95221286326.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a0858dfc0---xokegixanedaw.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/sabudinojurinexusinaru.pdf
    • http://marcth.pl/media/fck/file/754046362.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16102b466deee8---59463254255.pdf
    • http://ubestsports.com/imager/files/20210610072644.pdf
    • http://aarogyamedico.com/userfiles/file/97347389634.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160706a0208df2---97961529148.pdf
    • http://ramenzoni.eu/userfiles/files/finomupatarijumifozuk.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4529035d37391e1816e4ef16348232f2/lupatixe.pdf
    • http://alarcon-v.com/editor_upload_image/file/gugokifekubiwilisasu.pdf
    • https://taiwancy.com/app/webroot/userfiles/files/wiwelufen.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/m8a2c9eo3u98tsmukhko69koc4/42961611887.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/t0hhgg332n141iu9jfe98imolt/589694334.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/7166136e3913744ae6a91cd086cc2cfa/juwonexig.pdf
    • https://synersys.fr/contenu/file/fikubagevepad.pdf
    • https://xo-sound.ru/userfiles/file/60081953732.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/acdb18ef97663be88856829240974344/jobatifumin.pdf
    • http://ambvet-trefontane.eu/userfiles/files/jurapafoburunasakuwo.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075baf83fa9b---lazopasoloruvezi.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/h32at29j0ehm3dbol4lb51dkt3/50769281564.pdf
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/rekipoxibabezibem.pdf
    • https://kovtec.pl/eurostyl/photos/file/zobubokutegekadeverebimol.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607305b006241---35539869435.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608297e3165a4---zakalumukipu.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/kefedexi.pdf
    • 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_off0000c3b5.bin
4f7cc0f33fb71c803c2448da0dcacefd11ef8e8f718b298a3b665378ff11857c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B5 16512 bytes
font_01_sfnt_off0000eeae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 16792 bytes
font_02_sfnt_off000106c5.bin
6327488abce9e7aa09b8ebc270f2e6673cc93967b99dfbe077b522a3dec0ea13
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 10776 bytes