Malicious PDF — malware analysis report

Static analysis result for SHA-256 d122253551c10455…

MALICIOUS

PDF

71.5 KB Created: 2021-09-04 08:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 76681462dc07c41fcb37fc4bd07ea56c SHA-1: b6d00f4909e975e68e2ec3e2f062a184622b7995 SHA-256: d122253551c10455bedf22ca6720533ea0f370cab48abb48eb2143ce368f5c03
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=manual+da+maquina+de+lavar+samsung+digital+inverter PDF link annotation
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/36ab0df2d9e4582cb6d36934ce7cadd0/gesunuk.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/mitezaw.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d74926d9a---kaxusama.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/429a9f71e14ee735539863f9ddfd1b01/67523748219.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/0daf6395fab7e396a957a409d1da53cb/jowutilibux.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/l2a2utk5vrc3vgkhko62nvv985/36209292648.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/33442778131.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/toripiperumalonenidijimil.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/jibofosasagujodorusob.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/33476593703.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/f02a00e552c3fdc11abab0790d6427ef/5294132025.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/43637574906.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/7891fb0552f98e5217079ce2de8013b6/mimubipilotebezezof.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/77363505708.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/952e2e984b0091d8ba8c7bdbe36f2ce5/rabobizizuvarapafuvarul.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/97384893211.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/46sfbgf3gu5s89r4j28ddoj9bt/vokizufiwederoluvefabawig.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7979a673---xeregapaverujeganeviw.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/goxavir.pdfIn PDF document text
    • http://mploa.com/clients/2/2c/2ccb326c3583e393996f575e36ee3974/File/mobedidilutapizidoxowi.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835088c5771---56875266985.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/detip.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/puh73rdenjqul8dc9bdedaf276/wigukikidebimurosidu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b4cabfe5946139430a4faaa61ef579e4/38702807908.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_off0000b91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12D 15196 bytes
SHA-256: 8343d469a2c25c14f13da2956816b5bc04dd5cecef5c74df45f6547f13cac41a
font_02_sfnt_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 10776 bytes
SHA-256: 36aae0049fa6233c2def6c05ba32f38a80867b106f08f66bf8f7e545f228367f

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