Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd31f6ae7233779…

MALICIOUS

PDF

75.6 KB Created: 2021-09-13 22:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2c33fa22018a05c9822f940d84ec827 SHA-1: ec147e95d4e7dadc2508adc8245c15f6f032a794 SHA-256: 2bd31f6ae72337795f2bb489cbbfe4eee7eaa40b5b0e3158bc8c8c490b84b676
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript, flagged by heuristics, suggests potential malicious scripting capabilities within the PDF. ClamAV detection and ML classification further support its malicious nature, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 https://regaluxiluminacion.com/uploads/assets/file/dilaxasizeriwiperesezile.pdf
    • http://52963566.com/upload/file/202109122147269926.pdf
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/99776217382.pdf
    • https://speakingparrot.com/upload/ckfinder/files/zevotemofi.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396490681d5---17880605520.pdf
    • http://pp-aqua.com/userfiles/files/83860543368.pdf
    • http://sincaremedicaltour.com/js/upload/putamudezu.pdf
    • http://acecaalcoy.com/userfiles/file/fidabopamiref.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/futomodofovoj.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613729b47a728---50022026913.pdf
    • https://cplastik.cz/data/cms/file/fafudowafata.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134f86564280---doselisijux.pdf
    • https://landatur.com/files/galeria/files/69651775119.pdf
    • http://freeski.hu/freeski/file/tugutelumepodewafibimis.pdf
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/pekamuxijuwim.pdf
    • https://rheinfurth.de/userfiles/file/zitofa.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/59442394653.pdf
    • https://next-engineering.com/userfiles/files/31411577637.pdf
    • http://language-coach.pl/uploads/files/bekuludozu.pdf
    • http://le383.com/uploads/files/powikumimeragazusoge.pdf
    • http://123podkrovie.sk/editor_uploads/files/40869725772.pdf
    • http://lynhuagiasi.com/Images_upload/files/xasutifurobepenelu.pdf
    • http://gwardiajuvenia.pl/zdjecia/fck/file/dufijulisudosewi.pdf
    • http://hdg-gmuend.de/userfiles/files/vaxikaniku.pdf
    • https://maggievanostrand.com/uploads/media/file/82261455815.pdf
    • http://www.reeder.ee/files/filemanager/33690398034.pdf
    • http://m-camper.ru/ckfinder/userfiles/files/dajivilonunisenorikarodu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=into+the+wild+erin+hunter+read+online+free
    • 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_off0000c616.bin
99fc4749ee61a94438f503c6fa87f24861186c83f7dc0093ac8d951792b58712
pdf-font-stream PDF embedded font (sfnt) at offset 0xC616 16432 bytes
font_01_sfnt_off0000f062.bin
be612487b566faa72ef6c86513297a372fbc64abf927f10f3b67e75aaf328c07
pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 10420 bytes
font_02_sfnt_off000107f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 16792 bytes