Malicious PDF — malware analysis report

Static analysis result for SHA-256 399bb3f0f80135dc…

MALICIOUS

PDF

85.4 KB Created: 2021-09-12 10:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 305c52b77bbb9f3d1997609b51287ab0 SHA-1: c5b267f76e6a625031d5006deb03af052ec2695e SHA-256: 399bb3f0f80135dcdb147abb3f80f9d2ce5ea831daee7d42e0a5ecb9f11878ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://architettoangeli.it/userfiles/files/32794754488.pdf In PDF document text
    • https://ecosolar-energy.com/piceditor/file/dedipunefaviwinov.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/kezedewi.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/54487733749.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613862edcb6cd---31669531423.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/pewiletezev.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f2d65ec580f2cc0e8ca92184abbb0847/xowiralop.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-2/20210902190622486831.pdfIn PDF document text
    • https://drlanda.hu/user/file/pivutakagaxoxudawamumuf.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/43ba7c596f7813aca2d556e4fa825df1/muvirivafosivedeser.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/7378114492.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/39267169642.pdfIn PDF document text
    • http://poliinc.com/upload/files/60125799544.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/kinagusosemotepomunagud.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/fovetijonu.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/95897485380.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/redasexamewez.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/bigegilaveb.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/dinizejejikojaguwuwinajo.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/58028784088.pdfIn PDF document text
    • https://shidoremicrosys.com/media/85810062322.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210902_1620F0D77DB19917.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/040328099115.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/iuhinm0cl6qtucki2p97com7oe/82785008133.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/38821368107.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/45774bec7c833f82903cdb6fd6cc9a94/47030707039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=talking+tom+old+version+apkPDF 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_off0000dcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 10856 bytes
SHA-256: adec044e35b8b070b00945138742380fff0cbda40db2bd049b62ffc55be6f44b
font_01_sfnt_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 22096 bytes
SHA-256: 2f46d702fa7a45cfba7152d000d8fb0ed4688882d5a44efeac88e40e1b4abbc8
font_02_sfnt_off00012fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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