Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4da4f0dd90b2be7…

MALICIOUS

PDF

68.9 KB Created: 2021-09-12 05:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fffe3cdf7ec244d6469a4a6681a4425c SHA-1: a4d70cc25b8761d9190774f4ff2fc60a8456d6e8 SHA-256: b4da4f0dd90b2be70ca5994914e795aa02948cdb77c0e04ff234a302227c7d4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and compromised CMS upload links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://ipekyolumedya.com/resim_galeri/file/mevijikup.pdf In PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/kupazipafez.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/fafivetibu.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/bavazetazifafumivirebivif.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/1754984082.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/53515363456.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/wevekufexutazimuzidosuko.pdfIn PDF document text
    • http://asustainable.com/global/file/13530704092.pdfIn PDF document text
    • https://promise-land.com/upload/file/44831153095.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/duvaxog.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161330427dcb79---jokir.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/mipubipekovasonivujibepij.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/47202780962.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210912_D4B9E2D43A7138E7.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/99792497086.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/91530093776.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161377cf690fd7---padudiwexelusuxenosuviled.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/68075c5fd3a9b3f1b7f26a845dff2ee9/wizejebexixe.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/33265582506.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/98915119386.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210904033308.pdfIn PDF document text
    • http://fxmeat.com/upload/file/98099d6a14847d147be8033cd965602c.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/numasugox.pdfIn PDF document text
    • http://sentralperdana.com/file/93709073574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=app+to+open+publisher+files+on+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_off0000afa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA9 15324 bytes
SHA-256: 802d309a84e1d920f53c0c3b5fe52219b3a71c2d3c5467e2004e868600fc3022
font_01_sfnt_off0000d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 10816 bytes
SHA-256: 1e945a362a5f261cc4fdbd841d17f5aff57fa8c0aab86a5befe29dd9ea9c497f
font_02_sfnt_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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