Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ad3708ec7a036f…

MALICIOUS

PDF

73.1 KB Created: 2021-09-01 01:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a064cb3563203bdc46944574b77e46e7 SHA-1: c3f2c9325162515453df98e35c9ed55a1bcaee2b SHA-256: 34ad3708ec7a036f6e76a5e4f7788737dc40cf588f13ca1fe44f9b1d5a02e7bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=rudolph+the+red+nosed+reindeer+echo+lyrics PDF link annotation
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/d5ffe721fa13e6c15992cb29548e52c6/59850160856.pdfIn PDF document text
    • http://flexicourse.cz/res/file/pikibazeg.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/93ud1529ur45gk115vmpprhvq4/22479754330.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/p1mebcjk8abj26ljprmulerie8/zulotudemojisadugaw.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc68ced30a---vaxowagubimefavuza.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/320437723.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/3601538242.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/sovelizenoferinoremum.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/56830223772.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/78713531942.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f6c0c3e7---tixuwubilukabasefi.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/furewuvob.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/foxapudowoxurofedorerigo.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd7e9a61c7---bizoguramaxupik.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/kaziwewapiwafuxawoju.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/jodujomatareviroxewawese.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/h0lkoolaa83p8hnpniu3ubmhvg/dutizuxidorarubafegefab.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c87ece8f612---14571282460.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/38658872621.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa5f54f564---baratavenosidabefofovuku.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a183d481f4c---nenes.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b218914f29---97806005887.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160764b6894f82---73939546980.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/vesemonejurudegaseno.pdfIn PDF document text
    • https://lapdonline.org/file/81300541162.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_off0000bb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 16616 bytes
SHA-256: 5f8be1772a1080b5eab7b9fd6e691e787f5d285707742c0e938b3e1b7c30a8c1
font_02_sfnt_off0000fe29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 10708 bytes
SHA-256: f5ef86b57d04c7c34a9301d1bd9df33926ebbcaa60cf76df006b05e483bc46c7

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