Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56f3344ca7bb7aa…

MALICIOUS

PDF

84.3 KB Created: 2021-09-22 17:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b9fc37a13661990a4e642bb6f55aee96 SHA-1: e4097ea1169175f2d6ae24cce8280e12883ad127 SHA-256: f56f3344ca7bb7aa12dade0c5590315445dd98cab6abb880e7652f4da500d20b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://madveras.com/ckfinder/userfiles/files/fusakak.pdf In PDF document text
    • https://tyko.pl/userfiles/file/nufanenijumig.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/50096842781.pdfIn PDF document text
    • https://mihalex.by/files/files/sadanuf.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f3a2b473b---44033209416.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/porug.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/64419179377.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/60980641962.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/65367611588.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/551kcsgavkfrup4tdlu5tahd3s/binovujusonuzevanigazip.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/30296861683.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/91462674341.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/99722030917.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/60384524904.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/98487860973.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/650735969.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/marisuja.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/50001693755.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/jesepuvegenut.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161361bc0d7b2d---wepajaxokivomerofasado.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/niluranexev.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/pexawexazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+phonics+apps+androidPDF 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_off0000e602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 17764 bytes
SHA-256: 9577acc7480546de93247a322497c8d999b6c032e4f4e293df8672ef449713eb
font_01_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 10616 bytes
SHA-256: db0db60e60e7ba63f6219cb961cdffc060229e9d93b2493349eac6de859fbf55
font_02_sfnt_off00012bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1