Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9c92aec7d41d8f…

MALICIOUS

PDF

98.8 KB Created: 2021-09-07 18:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3867b08a292a53e58f22708533f3049 SHA-1: 5b209ba8a4d0090e93baa4c9543edcbedc84ba25 SHA-256: 9c9c92aec7d41d8f6560a2ab61fc42e082ba71f7f2b79faafe97a831113785c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. This suggests the document is designed to act as a lure, potentially redirecting users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/nrkaok8pph94s9lp8h44qe0ii7/judojepakuvufejum.pdf In PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a4b5ba913d1cb5a996a9518819eb4c36/kinudivunuxu.pdfIn PDF document text
    • http://santeh.md/img/files/66301535198.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/xavuwuretonepunano.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/2c1f54627ab2bcbf574b4dd0afa74bd3/52327556306.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fbcj633aqte547ds9qagnh2qi7/86608009823.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887f354e704---62449621859.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071cae3a918a---11963773100.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/77429223971.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/futelajudulovajuwubuzu.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e713537d20a8bc4c0bf81c7a1922be83/repewijovome.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/42487016963.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccff1da815---jebeno.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/51791416811.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/sunokudozaza.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9f4090cb2---dudotug.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f00c7e3409e---83281151961.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/f81orcmbev554ej09h40t3hs39/wixemirolodozo.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/57263307782.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/malifizinejelitozik.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/rabufomatofiwozafuvewuxom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=jonathan+edwards+biography+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_off00011c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C43 11060 bytes
SHA-256: 578ca48f1fd17a03d482d5dfecf3c00ecc4a143a78ece61938c614b2cf9f66a3
font_01_sfnt_off0001359d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359D 18504 bytes
SHA-256: 139f7f2571a1993871327e5afe396701857a03bb93f440cf181d08f421839cc8
font_02_sfnt_off0001659c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1659C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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