Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfac663263438223…

MALICIOUS

PDF

86.5 KB Created: 2021-09-09 00:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0805d8d17e6afa446a53447e7e394018 SHA-1: cff4c62b30d4f41961b353d30ea1176f128ca38c SHA-256: bfac6632634382238a7c328ac39f4f6344e6ac53f1024eb9ec2db647e19eb4d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised websites, likely to host further malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://tapuionoticias.com/ckfinder/files/namamimokotadure.pdf In PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/79918137270.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/99263108724.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/jikepuzetarosevu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e3ae4dcd---fotonirivukarado.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/fivoxadosunuli.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613929ed9d96b---padisabak.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/72874609502.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/binunijezuredavadexixe.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/xulitejotovabuxisej.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/tiribudevijodusab.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/5444851521.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/38915437515.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/29670456449.pdfIn PDF document text
    • https://network-italia.com/file/79440985450.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/39789503559.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/89310731130.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/96378519235.pdfIn PDF document text
    • http://pneusmarene.it/images/file/22645128072.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/lulasaxutetoriserujuxod.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/wufitawapobez.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/82882256843.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/5716765752.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16135aaa75f298---50142542616.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/kikire.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4f219ff5---lobarota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mcinabox+download+apk+latest+versionPDF 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_off0000e2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 20312 bytes
SHA-256: f5a1cfb037cb23180d87e2e973692bcb7fc23fa3d6e44459564f5efa2b46371b
font_02_sfnt_off00013114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13114 10988 bytes
SHA-256: c8180454f389bac485c1e39fd6e5a8b12a2bb08ed33371d8d55b06b525c5bed0

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