Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a3181aeeb6ec8b…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 18:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c63c1831627fc4ca9efaee4a42af79b SHA-1: 48d6275782c2d7a058d36d0ed9927804f164c087 SHA-256: 92a3181aeeb6ec8b9acca00e25d05f51e771509ca847048d97cf422662887eab
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://coretry.ru/uplcv?utm_term=fruit+ninja+mega+mod+apk PDF link annotation
    • http://f-kcc.jp/user_data/userfiles/files/xeparunepomu.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/ridijepipiwanugozuleput.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/24969919540.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/77988956592.pdfIn PDF document text
    • https://maria-galland.ru/files/file/popoxeguduz.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/teguki.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/34423036208.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/ragivamutuwi.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fde911f3a---torepuvegamukebutox.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/52986668482.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/29853493619.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/87486067111.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/79880663586.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/54302660934.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/xativuwopakafixapabafatar.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dunefikimu.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/38883449888.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b475ee572---sosibe.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/tudisijed.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/61329247293.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a31d04a4e---90678030823.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/22431521878.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_off0000bc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5F 15824 bytes
SHA-256: b0190bcc6ecb74402dc919b527be2cd27a20699cf89a3bbcbc02b56a44d6ec10
font_01_sfnt_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 10820 bytes
SHA-256: f8184f25e214fde7079bbc57c8584053fe4dfda804e536b4f5c9245f0912e9a7
font_02_sfnt_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1