Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bee897a417499f…

MALICIOUS

PDF

72.7 KB Created: 2021-09-22 22:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a94890465a4747241d10c441c540fbed SHA-1: 6c558fddf5db56875edeb956812f675934476c6b SHA-256: e4bee897a417499fdbf2c3c08bf2c857a75841aacbcddf09d4f1d9abba39a43a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://goldcoil.com/uploadfiles/files/11495612034.pdf In PDF document text
    • https://nergizleryapi.com/image/files/28967680525.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/vegurixiwetat.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/61389577831.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/26342030168.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134516cee8ee---5938771207.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/s6im4u0gikhs3jric01tj5gfto/defetotif.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/96979997933.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210914_163509.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/fivenulajur.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/tedifuvav.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/xawerin.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/gupobonesatefewawelabujev.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/55821035645.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a105df03e2---lafodemo.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/6198378126132861ba2650.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/delavuwuloruk.pdfIn PDF document text
    • http://sakra.sk/storage/file/40748108044.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/82903761868.pdfIn PDF document text
    • http://na3.it/misc/file/14303580450.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/69189115057.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/tipokajitusubadalajopidib.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/bevizemafodoresav.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7619324295.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb30d796b---6473779153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=proguard+source+codePDF 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_off0000bd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD78 15644 bytes
SHA-256: 4eab11e3fc16467bfbd130afd4f2a4bbfb4286bb5fe13cdbd405b45db30a71b0
font_01_sfnt_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 10308 bytes
SHA-256: 2d4d29c9dc5e661ff8b58ab0be02015a5cb2f57fc4350caf301f290ccce2ba7d
font_02_sfnt_off0000fcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1