Malicious PDF — malware analysis report

Static analysis result for SHA-256 b943cfd31254fec6…

MALICIOUS

PDF

74.0 KB Created: 2021-09-11 10:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ee229342566dbea3dabb89ff4ec7e19 SHA-1: 1d51d4f2602aad05c6205987e734f2e1106dcd6b SHA-256: b943cfd31254fec69196882adf058c6d79002318230ed15de9c9be95d12dea8a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The embedded URLs and link farm structure suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=android+lock+screen+video+wallpaper PDF link annotation
    • http://runnersavezzano.it/public/userfiles/file/sigetowunotepul.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/90568816709.pdfIn PDF document text
    • http://szcftz.com/upload/2428042947.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/49491119744.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/49861124256.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/58418966791.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/47855105194.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cfa4g2nq2b4fcp2icu0l7plujp/pirabobipofumijisasav.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613770edf3384---lolimomawolanuxoz.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/nobinisuvazuxitowu.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/rurigigi.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/27121418207.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/21554031834.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132009c27dc4---30650952980.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/nabuwepetu.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/28473275232.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/12994724413.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109030401078452.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/31be303be77f89ed54921dcdb5553de4/48210256855.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613932e2c6583---putavulozibaxi.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/22623396993.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/puzalelikexumetixegaraze.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/revegitidolibulexaj.pdfIn PDF document text
    • https://projetovm.com/uploads/files/23130262853.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_off0000bef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF5 10632 bytes
SHA-256: f994725482dcfb0bf064e9970b921129b0cf760a803dcea7518ce271ea5ad8f9
font_01_sfnt_off0000d76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76F 16652 bytes
SHA-256: 7dc4302b3a8f2490502eea1c3275116418c0511fb62c7df486dc9659512cd696
font_02_sfnt_off0001028e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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