Malicious PDF — malware analysis report

Static analysis result for SHA-256 106296e53846d2c7…

MALICIOUS

PDF

93.7 KB Created: 2021-09-15 18:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc5024502f336cef88e7f621be927239 SHA-1: b75c53e789abd70ad063350873b0db8e85a70284 SHA-256: 106296e53846d2c7903189f5ae31876d5ee57f47f1e43b82fb90d52e76a03c2d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristic firings suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 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.
  • 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://www.klimavill.com/data/editorfile/93899874867.pdf
    • http://crediramasrl.it/public/file/75944155082.pdf
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/xonep.pdf
    • https://resortweeks.pro/userfiles/file/zeniludekeno.pdf
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/betipolosibetaj.pdf
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/gepivaxofomixalera.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/53485366107.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/zuranisokiwi.pdf
    • https://horkolas-gatlas.hu/ufiles/file/vijijimivolafenasovipeg.pdf
    • https://akamercedes.com/images/uploads/files/8859158790.pdf
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/5291939351.pdf
    • http://flyingkirin.com/uploadfiles/file/051006168242.pdf
    • http://riph.pl/userfiles/file/95720126151.pdf
    • http://cpviettin.com/upload/files/maludupupobepupif.pdf
    • http://scandirent-new.ru/uploads/assets/file/leninazotusafeponexoz.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161384a45869b7---wibibafivipuwufafalonojep.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0fa9e643c---23054601588.pdf
    • http://glassick.com/userfiles/file/48344397166.pdf
    • http://zovsh.com/Uploadfiles/files/71404959565.pdf
    • http://yao-cheng.com/uploadfiles/20210906073002.pdf
    • http://klubalfa.org/img/userfiles/file/56709823683.pdf
    • http://sfipl.in/userfiles/file/gopugubabij.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f8bd672ac11972b8517fdd61768dac2a/93215122682.pdf
    • https://luiginoiobbi.com/userfiles/file/nevufomadig.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161330be12851f---98766118442.pdf
    • http://cybernet.asia/UserFiles/File/46210607811.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=vlc+for+android+latest+version
    • 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_off000105f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 16792 bytes
font_01_sfnt_off00011e0b.bin
4dd23b866453caa34b9fa986d855265412878700546febef3ae8eaecc2cbec86
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0B 19272 bytes
font_02_sfnt_off000150ba.bin
7e83da0cf7a1ce94b5bc8e8db28c5e067ec427a4f2e7ef5de85b4cc28564dfee
pdf-font-stream PDF embedded font (sfnt) at offset 0x150BA 10504 bytes