Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b0a293f74058457…

MALICIOUS

PDF

97.5 KB Created: 2021-09-15 20:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5610fddd9a50411f900cd9c68cd71836 SHA-1: 022df7c95c208834c476d137cc65cc35f4e2a7a9 SHA-256: 2b0a293f7405845776d6a35ce79ebe8067c24daa483392e782ca5a9b93f925de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve to redirect users to malicious sites for phishing or further payload delivery. No scripts were extracted, but the structure and URL distribution strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://byocamacho.com/ckfinder/userfiles/files/41845714557.pdf In PDF document text
    • https://bor-diing.com/upload/files/kavonojodajoritigumukis.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca9112b20---dusitefegepuv.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e9035f70235b7acf2077199c860b6557/63397742737.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/53021524982.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/57529057333.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/23506493171.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/gipekonivapomijamawokadij.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/tubebowewal.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/8314190538.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/fupesebolade.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f25374e2aa---34359145192.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/31751979888.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210910030526.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/pukujibuzuje.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16693b344---mefebovad.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090412053886877.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/kopim.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/veboxuvo.pdfIn PDF document text
    • https://toocapen.com/files/79210899181.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/28767825746.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210907144859.pdfIn PDF document text
    • https://agatanorek.com/files/file/xolopitadixikikeditav.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/86254514153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=movie+friends+reunionPDF 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_off000119a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A8 18364 bytes
SHA-256: f2bc79e7f1d8c4024f80eb209894e80bb5a865125ed82548e7af19a70801b1e6
font_01_sfnt_off00014987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14987 10200 bytes
SHA-256: ed9105341378291f1e0c10cd56df1ac29562c5f5edb382568fd6f034168fa747
font_02_sfnt_off00016089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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