Malicious PDF — malware analysis report

Static analysis result for SHA-256 af21ac0268b8a43e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 01:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d22a4c07aab29b0c00beeb05db142a6d SHA-1: 38be90fbb65952ea2cb54dc7d60ebff9c273b3ec SHA-256: af21ac0268b8a43ebca63b368120d28fd099baa6400740fafaf52e6c12daf13c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://arci-mp.fr/admin/File/44227811040.pdf In PDF document text
    • http://resetimpianti.it/reset/public/file/mosexoxubojokigaxasu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132350b797bb---kemalelunuxifaluvuje.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/63834128792.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/97788957067.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614083be2ddc8---27641623375.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/nadogujik.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__612F57BFBFDD8.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/pepabapokolupelefur.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/wukutaxamukozikuxabomumu.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/1ac9b3ea4598516d556adfe53a124157/49808325229.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/nelewireja.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/sixugodew.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/nigonijosowozoxokado.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/03d4b15be88fadbb3ff48299de62178b/tadata.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0757cd270689d46c0cfe03c3e4ee703f/konabukazawodafomu.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/10180481657.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/52100905259.pdfIn PDF document text
    • http://asid.rw/userfiles/file/25109977919.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20210916203323.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/30992119673.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/tuzojuzikutudexox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+win+every+argument+book+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_off0000d8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A1 17620 bytes
SHA-256: b94ec387bd3f5e31c9b15c30cf5b3ee11796ab3edd1b70ff1fa9df336937d6b8
font_01_sfnt_off000106b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 11216 bytes
SHA-256: 4ae2445836281e8a020f2a3194a8e4aa67ffc07815a8a02d706b7bbd1548bd02

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