Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e8eb32ba56e5d5…

MALICIOUS

PDF

77.1 KB Created: 2021-09-03 06:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 00b64f5947b4a094dc41a6ac4def73e7 SHA-1: b84ccad0497fbf06f1b560661853f96de559ad0e SHA-256: 19e8eb32ba56e5d590f2b8dafeb6f86327f5542f90424e3d7801256a946c610f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=ordering+negative+numbers+ks3+worksheet PDF link annotation
    • https://hondaotohaiphong.vn/upload/files/14619913962.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/d255169741807c907adf05feb1066923/venozanixujupulon.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079f5825c4fc---tidonixotegetavan.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/sewidudovemopepiwi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/wutum.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e112cca9d1---daferadad.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/wapekirumelogoxi.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/xesewokimineranebadene.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/76136489036.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6dd86d7538982531343720aee975fc7b/kotaxobanawasel.pdfIn PDF document text
    • http://friulanapanini.com/images/file/maliwewitumolikeditoragez.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/48887078244.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///dovazixa.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/20716540311.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/pumopikotokatejas.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160926df91b323---lodegisomitaturijemikebi.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2562809f4---56246943506.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/64008007759.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079fc7425cbf---woxudufexumuzusanawar.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/41fd425ad0830a280850330be97c623b/gatoj.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/30202411311.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/rafopinitojedonekur.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b95212c19---xulubabiso.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_off0000c7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CC 17192 bytes
SHA-256: 5981033b52304692f2c2bfd9fd384089c27cf832ec04a8c7f18b3c8b3bc31d25
font_01_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 11328 bytes
SHA-256: d1b3c989f5350e042f0992e82a950dc76a9c70d571238c46e83f8f57d418fc9c
font_02_sfnt_off00010e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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