Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b377453df02ba6…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 07:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c16b1e68412cf87541815096900ff2b SHA-1: 494ae69de9c2dbfc2af595eabe8072b0b5c704d8 SHA-256: f0b377453df02ba6b5bfe496a14d9f5bcd23ab0a7a8ef491b46556e9bc663598
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised sites suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://camgloberealtor.com/userfiles/file/96771232450.pdf In PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137e9692ef05---49088219397.pdfIn PDF document text
    • http://keitbg.com/images/files/mivepirezewevetavi.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210918051138956121z54db.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee30de9aa7---tutubuvexixemanudabefokit.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/luligumerazivagoged.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/kerof.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/parejiputasudukigepa.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/funanojubabejabitezu.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/36175713048.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/pesesomeralamuwirupesepe.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f1b9c36e8cdd369b11b1f388e34a7ede/93737712869.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/pijurufekotemugidudowoxu.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/jopojusanilugimo.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/kafogog.pdfIn PDF document text
    • http://4darchitecture.org/img/all/fotaxi.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/mojixowobazi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130985f32877---36752080502.pdfIn PDF document text
    • http://didula.com/img/file/8884657305.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/12096111814.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/tilofekubowarulisem.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a60517665f---giwegekuwukol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=zverev+thiem+live+stream+freePDF 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_off0000c687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC687 10284 bytes
SHA-256: 42ec2267877cdacd20817f3827174ab6a0f26efb8e9fe9f93f32cc87106b898a
font_01_sfnt_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 18444 bytes
SHA-256: e23eed5d1685d64d1ccd74ff4a0a9a33c491fbbad6a1fdfbf5345368adaa432e
font_02_sfnt_off00010d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1