Malicious PDF — malware analysis report

Static analysis result for SHA-256 14eda2a8e394588d…

MALICIOUS

PDF

73.0 KB Created: 2021-09-03 07:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22f8c9f0c62ab619acd2efcc0a5e2000 SHA-1: ef6f04c49d35b9f8405877ecb8a9f6766c56ffb0 SHA-256: 14eda2a8e394588d306fc17edcf41b16bf149f9238a258113936046b9f7224e8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/5d3f0ec7649ef0fb84e5dfc8e3a6e642/ginarekit.pdf In PDF document text
    • http://makassitools.com/userfiles/file///15585243709.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/kuwunosizuguror.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/dajaliritetavig.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608561e96852d---96360269288.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a4607cbe9c3---23287584135.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/12879d1ed89a0769997e007ec16c0368/rujas.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/4326099132.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/60596458900.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/kitijoduwawabonobex.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/20048606993.pdfIn PDF document text
    • http://charivne.info/images/file/12986885780.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51478a3269---vibupadetuxakeme.pdfIn PDF document text
    • https://ocw.tw/uploads/files/nibikevawowusivutefo.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160adaf6140d2d---21145180432.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/13725130202.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e1e46a850---bamavuje.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/xinavo.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/lofedugupulerulunafem.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/19739057575.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/da22c64ae2a71af7cbc34b073ddbb3e5/lonepozemidexatareru.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/bkrpb660t08f2tmdjha8csm852/podigosemunurize.pdfIn PDF document text
    • http://benefielddarrenfordhicksunited.com/clients/2/21/2186b72972973349411f8b90e6071e14/File/62557021644.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/dorezugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=estructuras+de+hormig%C3%B3n+armado+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36D 11244 bytes
SHA-256: b2a80c263e88a04a06c266cc5f1e3a73063a3d5c6e37a99eda025151c538f812
font_02_sfnt_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 15760 bytes
SHA-256: ffd0aedd79057a3eb0f913b3b229086060c70344ea08c72f3c680879d3c2bc3a

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