Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0183a10fb5cc7dc…

MALICIOUS

PDF

71.8 KB Created: 2021-09-13 00:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff23c30ac5508b336cf8aa8c995df56c SHA-1: bdeb78b71932278d7d01abb8c9cf9168c27b1720 SHA-256: f0183a10fb5cc7dcf92c96e1e64f0ec7ee00b0771d7d1ea5c000052af041ee30
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a large number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/33292214712.pdf In PDF document text
    • https://livbiopharma.com/userfiles/file/mezupoduledi.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/14655051693.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/29853860565.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161382abc2d485---30923268995.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/goledogejawimojiwukesovel.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/2215926162.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/50366081779.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/tewosofunejefikujemuwit.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/xowakomisunelajipakirame.pdfIn PDF document text
    • https://12waktu.com/contents/files/webegumukafe.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109010331296849.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/82682581310.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/muweferobewum.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/linifod.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/betivadaranapid.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8cdc71294f46e266e349162a5ee87fd4/60627775425.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340b988a926---91841266623.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/bezuxejuxilarifopale.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/87257841052.pdfIn PDF document text
    • http://asfalon.com/__files/file/17468333952.pdfIn PDF document text
    • http://serting.eu/userfiles/files/vetifevexagitapu.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/98324901129.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/68024859302.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/menilume.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fa0a925a823c17b10e32ebda8920dd39/fisuwanewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+game+for+android+gratisPDF 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_off0000b9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EF 10784 bytes
SHA-256: a8ac3cd1297af81979b31a95d02701cc188f5fd2efdf2bac3a443683800bd960
font_02_sfnt_off0000ea92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 15272 bytes
SHA-256: 4006197a5324eb5d6dcf847d323ce5f2de05d05e0608506b3079f3de2e81077a

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