Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b3bbcc9988a3d4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 02:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 244322cffe47f77ed9803f4336ebd170 SHA-1: 8db01c111d3b8319a16f30fb7c717b976a6a771f SHA-256: 88b3bbcc9988a3d45d9db00a5800bbb6c8496140ccbca8a05b58b55838e0d80a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, aiming to trick users into downloading a malicious PDF disguised as a software resetter. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b825cbc74904b5f53585886b0bbb964c/pevitaranubovibom.pdf In PDF document text
    • http://fluitec.fr/ressource/site-image/files/30840325288.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/35197073004.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/98b2632d8c6fd96b629918788c62a862/37379465409.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/dujimarimafagesaji.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/6197938975.pdfIn PDF document text
    • https://derfo.info/resimler/files/jabuxexavegimu.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160874ddd5b92e---ludadomedupowipofe.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/mipugeb.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qj3u8lbhquh33m8vapj2pf6ivg/xabivifarolimavigomu.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/81471009553.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a9c3d6c6---moxolukulo.pdfIn PDF document text
    • http://health-bridge.in/upload/file/18854122171.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c53551ade47---57056716123.pdfIn PDF document text
    • http://premium-t.info/files/files/lepotetebodojijunejibad.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/derokalorasaw.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/fefejezonivinivasarud.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/4ca3b92ef71276df47beebf8530de5b9/zoresaluf.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082c8f7f31b0---volomanalinilibosip.pdfIn PDF document text
    • https://rajaunited.com/contents/files/pokuvip.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/tofelekeririmejigirixi.pdfIn PDF document text
    • https://mauspro.net/upload/files/xifitobatogenajusejumekeb.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/78808831748.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/31521347530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=download+resetter+epson+l300+manualPDF 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_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 10944 bytes
SHA-256: 625a148d84e99628899cbaafb6d268a35f4ad790d64add5131a01ce9981fb25a
font_01_sfnt_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 17900 bytes
SHA-256: 5c2637a45db84ef0a9d92162d932280a88d5294b921d94d99a5c3ac01db8c1c2
font_02_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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