Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1e54a54e761b8f…

MALICIOUS

PDF

77.6 KB Created: 2021-08-16 06:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee826ba20e7df97c0a23209bb597e15d SHA-1: 1353d2d1ecc42ed1dad10299af9e10647bb77db0 SHA-256: fb1e54a54e761b8fdc9701aa85cf0bf51703ed2f8d6cd1ca9afdc61d7ef9dcd3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS installations used to host malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous suspicious URLs suggests a download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gesht.ru/admin/ckfinder/userfiles/files/80791745297.pdf In PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b32ee53aba7---15508264877.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/nejakaxonowirura.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/zuditebetu.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/88769451156.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/nomedubuviluje.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210816065947107892pl2oru3knga3.pdfIn PDF document text
    • https://irantruck.ir/data/file/22502654152.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/89400353061.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/89820993720.pdfIn PDF document text
    • https://ocw.tw/uploads/files/fazapofifidadu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086537da4a33---84023547939.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/30774082695.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905757d0d77---42857872307.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/gawasakanororomonozexe.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/nafapajilarin.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7b671c072---xonesufubotokat.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160946fd36f661---77322574903.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/66317515084.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/jimedarewubobetewafexe.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/3451236374.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210505203439.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/4b9b37eba526729b301dce4d4b8ec2db/kaxorafamiwezoriten.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/tenusekaxil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cevsen+t%C3%BCrk%C3%A7e+okunusu+pdf+indirPDF 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_off0000c70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 10964 bytes
SHA-256: 4a8e08baf4181545e0817d30f805074ad5fca204a0e9520999547a0cdb00cfe2
font_02_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 18288 bytes
SHA-256: cfb2ab49b32ecf959fa49b1ebb9848aca64ecb202c7d0f7b52f2c183f2ca55c1

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