Malicious PDF — malware analysis report

Static analysis result for SHA-256 96af1d5844077dae…

MALICIOUS

PDF

91.1 KB Created: 2021-09-19 23:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 19bdcb1efaa002859a75c13525145d89 SHA-1: 739fca0f7ab1896e84bd64309059c3246012311a SHA-256: 96af1d5844077daec4412b30334972a3a74b053c32f2afd5a9aafd60b279fd6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://irlanc.ru/uplcv?utm_term=samsung+galaxy+ace+running+slow PDF link annotation
    • https://unifor975.ca/userfiles/file/gasadoxiwugotalafazigoj.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132f81ac3291---nidulimebo.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/38899245419.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/u041ibks1npl3ige3eljvu7935/pawisi.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/rozavepejujizusuronifa.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/gidapas.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/jifogiwaxesojowakejaxoj.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/18183923078.pdfIn PDF document text
    • https://tomas-music.com/contents/files/65973444975.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142abc879ef6---logosifixilifakob.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/fodazedizusu.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/67583459257.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/62695359552.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/xiziniwudinonoradutelebi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0804ccd2a---xojixofasenutuwus.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/11087043343.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/95187170621.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/69671574631.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/madumuwulogepi.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/44927571795.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/vilobil.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/10920300848.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139293069b---14611939993.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f48b9e563---68977616056.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-11/20210911140004231608.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16137284bc2dec---zonufijuwoburakugoji.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/34485607184.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_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 18380 bytes
SHA-256: 6706069124bfcdfa1d47caef35bc9ecd39fee21c750f275b13698f500586e0c9
font_01_sfnt_off00012c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C89 10952 bytes
SHA-256: a4f2cd759a1c94d4f784fa5f8044202c5c4105ba51f40fa0f8061e2d6c648b7f
font_02_sfnt_off000145f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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