Malicious PDF — malware analysis report

Static analysis result for SHA-256 411262e0adf3e2c5…

MALICIOUS

PDF

72.7 KB Created: 2021-09-14 15:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7571bb5eed06f7057b32357949d106e SHA-1: 1f5c0a95576d394abfa7274db2f022134782a1a7 SHA-256: 411262e0adf3e2c5120c221a1f38a02c4bd41157d5ab4526c9d22350ae880151
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common technique for distributing malicious content or conducting phishing attacks. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown-reputation URLs strongly suggest this malicious intent. While no scripts were directly extracted, the nature of the link farm and the ClamAV detection indicate a malicious payload is likely being served.

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://infrive.ru/uplcv?utm_term=inshot+pro+premium+apk+2020 PDF link annotation
    • http://pathtojanna.com/userfiles/files/venokerometifejusukanek.pdfIn PDF document text
    • http://nensi.si/upload/file/12605095501.pdfIn PDF document text
    • http://3sdent.com/upload/files/84821598750.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/dojowifunamaburizaru.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/mejusal.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/6994968896.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/58945494470.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/nonelunogelejotet.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/e599feafe1bf31c0fcd690d073be1705/novonebanavisolit.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/42871309801.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/lutadifizovutisu.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/dokaxa.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/71551239090.pdfIn PDF document text
    • https://aildf.in/userfiles/file/4872789929.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613f011022c88---bulolosopejuxadawomoxato.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/fufomogurovijabijul.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210910_5614DD83356B6478.pdfIn PDF document text
    • http://videlec.be/ressource/file/51030259209.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/wazusaganabiwe.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/rajexineboxij.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/69873960039.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/wukebabudi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136c9bf6ef43---31519270552.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/vevasaduguvewesopugupugom.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/43345006428.pdfIn PDF document text
    • 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_off0000b397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB397 18152 bytes
SHA-256: c83e57447f11bbbda250e26ecb1a28b158dafafb09786d6236d5e07b12b1c469
font_01_sfnt_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 10856 bytes
SHA-256: 639b512b047899e2a764be0afbe5dfe1e3663012328b48b4bf0ae69665fb1e4f
font_02_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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