Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f4fdeffa41029d…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 09:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f35dbc645233ff12b957b246d8cb14d SHA-1: 6a23a4b072aa44dbbba8abeb16cfee16533bacd7 SHA-256: e3f4fdeffa41029d23175bfd71b6355a70f8ca1e41c97401e9682ccaf0cb5ad0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to external domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The heuristic 'PDF_IMAGE_LURE' suggests it's an image-only document with an action trigger, typical of phishing lures. The embedded JavaScript and link farm indicate an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://marinapogon.pl/upload/file/2756097561.pdf
    • http://jtg-antracyt.pl/files/file/2870923215.pdf
    • http://flapboxes.com/userfiles/files/dokajib.pdf
    • https://unitjaya.com/contents/files/rifonavolewolugiled.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7c3266ed8---60492278167.pdf
    • https://fpcofmacon.com/nbloom/fckuploads/file/90440880103.pdf
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/jerak.pdf
    • https://valgott.com/images/userfiles/file/14408528207.pdf
    • http://medrea.ru/upload/files/wezagisomimekuruxaf.pdf
    • http://www.patriarca-batiment.com/ressource/site-image/files/puzuvalabiwisosa.pdf
    • http://clubselectionvoyages.com/images/file/nolobagunusud.pdf
    • http://x04ydivan.ru/userfiles/file/dupodapupilesuzafun.pdf
    • https://linker.tw/files/mudapepopumorujekira.pdf
    • http://kuryakyn.ru/userfiles/file/bunidemufonibukede.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2f62ce43f6e098174976581e587b904c/62016521334.pdf
    • https://signos.larrialdiak.es/files/galeria/files/kedizetopizaz.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/usjgdcn0flvg5qbg8elaihcapc/menopebonum.pdf
    • http://h-n-s.net/userfiles/file/fupedawamipewuvej.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613996d480b7e---62206404585.pdf
    • http://hcstonetw.com/uploads/files/202109201951134345.pdf
    • http://drironcat.com/images/file/kexawuzetoxe.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/zizufo.pdf
    • http://myredm.ru/uploads/file/68607652330.pdf
    • http://pnmanagementsolutions.in/uploads/29432170229.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613730f708cfb---65532976051.pdf
    • http://cserepakciok.hu/xdata/file/42754888026.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+the+collective+noun+for+chicken
    • 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_off0000b47a.bin
0ae9a26bd96eace5f6af21f3c89d56ad8fb53370e29e6055b6dcc93c77d10932		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB47A 14088 bytes
font_01_sfnt_off0000d750.bin
f5fbd29a38fef42b63eab231c738ca3c4c918ffcafa96d6667d318ac377da40a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 10684 bytes
font_02_sfnt_off0000efd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 16792 bytes

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