Malicious PDF — malware analysis report

Static analysis result for SHA-256 275b5a458e6c0a78…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 12:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dec50dbf3db8f1ce09b8e84a8575210d SHA-1: 286a9d1b03cdea87ea550e3f9b908f2f339a380a SHA-256: 275b5a458e6c0a7836a41aba7159429c3b3d0fc40be858f8e35fd9b1cf18c1f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to numerous disposable domains, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.anaja-inter.org/public/file/sonobifukijajuwal.pdf In PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/zupebelonikimipojil.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/85970551256.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/50780614294.pdfIn PDF document text
    • http://df-2.de/images/daten/file/95497807391.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///11550139445.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/jewesomif.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130b1287f7d7---lonuzuji.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/xudugazosajexikofigupot.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134a5c795554---bekosadusiwonifodupovuv.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/zonefafifegubatajamo.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/80879619376.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/72241384952.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/nasijepufonujirew.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/zoximesur.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/74131107022.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/94422082673.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/2bjp6gc603b70qjabn095b3bh8/gemazifoliwenosusiz.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613532efab904---17466447959.pdfIn PDF document text
    • http://debten.net/UserFiles/File/pabobe.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/31411821802.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/josojemolagakupafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+monk+who+sold+his+ferrari+download+ebookPDF 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_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 10804 bytes
SHA-256: 5df1692575436e45dd231c22cb6d276a7dbe412943e2151dd9250ac9f4f4f27a
font_01_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE2 18092 bytes
SHA-256: 08ee05bdb84c2fe4ca6658f9dbdbb1b1c44a9d27338e28eab2a666f576a4379e