Malicious PDF — malware analysis report

Static analysis result for SHA-256 49947f540759c466…

MALICIOUS

PDF

81.9 KB Created: 2021-07-03 07:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 10f5154c88718b689a2344d87c66ad59 SHA-1: 95df501cdf46a9764111d3283dd14833b886ea81 SHA-256: 49947f540759c4660f29bc40355620693e5cadde5708662c53f888f227e8e9b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://egyiksem.hu/uploads/file/31062079138.pdf In PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/qd1vj5a4op7fu26m763o50i97r/busilato.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7efbe1617---34791241107.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/sulidav.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/90326680882.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd7425a9df---69612492147.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/42281990672.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/retobefus.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e059972d92---50133117547.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/zanugag.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/b4186burnh72r2ollac6ht78k5/fatewevuwinuxisu.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/xuzivudipemawik.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/73360684211.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f4e894996107c39039cfdba07bfb04ef/81029873766.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9abbe2cf---61183889710.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab27153faad---jefusederugijezozep.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb265c2773---95715348654.pdfIn PDF document text
    • https://cooperspick.com/files/87493372397.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/47365747019.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/92880372668.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a57506b1790---72151766651.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/22658958002.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/kaxexuxizogitup.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cc1d95c75---73453278172.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083f207cd517---sekifetomonipip.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca54e8587---21079418231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=heat+transfer+a+practical+approach+solution+manualPDF 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_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 16796 bytes
SHA-256: b5b29ef5a43f57d2a84f45037c64e54340c890a7a9ad6ff9d402eb8030f995e0
font_01_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 10836 bytes
SHA-256: 4a7e33b2cfcd0b5418efbf5f6fc0449985c28242df93f847477077978a67837f