Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00b7f901b247dea…

MALICIOUS

PDF

87.1 KB Created: 2021-10-18 07:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c5eca2945efd0252c8b2aee44517d143 SHA-1: ff5cd218984c0574da2d4bf1661a4cdffd71e006 SHA-256: e00b7f901b247dea870e99915c43adeb35020b900383e1153964c5e2790865b4
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous compromised WordPress upload directories, a common technique for hosting malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16152471c5de02---27263134066.pdf In PDF document text
    • https://nppmaudaha.in/ckfinder/userfiles/files/nomerojobu.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/33279195703.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/28011785995.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb7d2bbc6a---revapazovabuwovelukudojup.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/23819133165.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/gefumowewebofaxoxus.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/96744681978.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/betonumekukiwa.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/fowatoduvejasowevokimoje.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab2a6qmelq8eaebhr8satebtpe/99459777132.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/94253402651.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/66060993543.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/91107516783.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/76225236724.pdfIn PDF document text
    • https://galantemontagnana.it/ckfinder/userfiles/files/263969251.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1616b82cc4cfa5---65052657995.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/35379795266.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/75354845020.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/166914169261353f9675ae7.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/petoki.pdfIn PDF document text
    • http://lex.tj/img/file/lujujodupudimodekomiz.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/sanefatirexamojedeju.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/71801655991.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139244fc337b---meruxula.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16151efd193273---39608085930.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RC0zOYPQW8A/uplcv?utm_term=without+to+infinitivePDF 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_off0000ee39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE39 18944 bytes
SHA-256: dd17f228f20d634b5845aa2f91609709057a672f76399b8fab7ce0d1c141360a
font_01_sfnt_off00011ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED8 9996 bytes
SHA-256: 91d086cfaabd8a31f8f0ef7f7ad98fb8a14d1402f87d6264f48ab7d005404f92
font_02_sfnt_off000134fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1