Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e4797cfc4070c6…

MALICIOUS

PDF

75.0 KB Created: 2021-08-07 20:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c3bab246631507ee8000440469b7cbb6 SHA-1: d3d9884d01ed8c7bfb5ca87be6aa77bc3b1629b7 SHA-256: 96e4797cfc4070c61ef21aca11c6acb8b1ba1cb787238573a5876c33e9c33436
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by heuristics as malicious and by ML classification. It also contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a027ef2e0---wudamoxigimuxoguluxati.pdf In PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960a5f02d3d---jemum.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/fisopipodowe.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/91045950673.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/vapeta.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/jixotab.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087a4475dfe5---33088017773.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/mazuxivaxu.pdfIn PDF document text
    • http://malifer.hu/upload/file/84046667818.pdfIn PDF document text
    • http://muszempilla.com/files/file/kikol.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/xupasekarojefubufufonesut.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/gutugilimemin.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2ab2e75ea---wepidukeg.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2d1aa4c4c---31041486603.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/e702d57afd421e007f8cbc334b48adf7/sojeduvepumiti.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/84529668008.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/98567242149.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fogln803jisdkvgigcm4r8rj8m/98268974538.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/86757218767.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/xidevag.pdfIn PDF document text
    • http://hanbangrd.com/userfiles/file/20210726221444_296223192.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16085510dcfebd---tipuworajiritivuzod.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/872d627169936ca7e66d07261561ae89/37745743043.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/lojabezamoxaxurix.pdfIn PDF document text
    • https://manenshop.com/upload/files/32526988816.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/gevojamilobedivofipep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ejercicios+de+matematicas+6+primaria+santillana+pdfPDF 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_off0000c119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC119 11060 bytes
SHA-256: 01adda3837be7db36a08ad84d91e02d60f6a0b210e4cc3453bf16a4c8fc7cb2e
font_01_sfnt_off0000daca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 17532 bytes
SHA-256: 828eae645ab3f3c357d5c941579a461346617894eec9d1a16be023d9b8b6bcfd
font_02_sfnt_off00010672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1