Malicious PDF — malware analysis report

Static analysis result for SHA-256 6661cf089330e780…

MALICIOUS

PDF

87.9 KB Created: 2021-09-18 12:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 69bd8217b400b409bf5840be88364e21 SHA-1: b3a1c6fb48bb6ff0c94e1d5c9d88a7b7b7bd0a7c SHA-256: 6661cf089330e7806f8e3cd9594e0674f796ae154e55ab91e54900ae97dfb50f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inwebjor.ru/uplcv?utm_term=display+phone+screen+on+tv+app PDF link annotation
    • http://wohingltd.com/userfiles/gefiledasejevasamituw.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139546cc675b---savazen.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb6605143f---zaxiruxopofizinipodoxepi.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/60241423324.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/91853251599.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2074c28c---rigarox.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c1f8ccb5---letesoxikazotu.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/lasifumub.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/rexetoro.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/5712680583.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/71172026046.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/kerujanatejaduruguw.pdfIn PDF document text
    • http://midel.me/userfiles/file/favafufever.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eb5ba8c97---92960202673.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/fogaxuw.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/xolosagututavujetevem.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/4dece7598d9e1dec986e9f67b76e590b/mipanokinuzaj.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/zefigukemekenujizumabet.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/lavulapesirewumevireza.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/visesir.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/49043823494.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/feferidimefedotexebowe.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/tiviresujanademavekerexi.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/nevezolevup.pdfIn PDF document text
    • http://zl369.net/userfiles/file/52937201300.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/tizinurigukotofod.pdfIn PDF document text
    • 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_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 17832 bytes
SHA-256: 750d8b23a7a43a72e4087d73510819ebb87c0e5b992640e1cf4d7dd51b9fae56
font_01_sfnt_off00012117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12117 10652 bytes
SHA-256: 933fba61186e7179a24458f830ea5bb54b57102c10f0b39a24d3a11c17108588
font_02_sfnt_off0001397b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1