Malicious PDF — malware analysis report

Static analysis result for SHA-256 96744ef2c78761b9…

MALICIOUS

PDF

86.8 KB Created: 2021-09-22 11:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f62931bb96e89b9df1195e46e609f568 SHA-1: 68504ca6e05daf199ee306252c89f2f6dad07ae1 SHA-256: 96744ef2c78761b9b8b37683c4c1d6613aa13a966397fd229062487c776dde28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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://garage-ys.info/js/upload/files/98281810916.pdf In PDF document text
    • http://czyxchem.com/upload/files/30831168075.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/39180863457.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/46802869354.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/jemidopezefe.pdfIn PDF document text
    • https://go2germany.ru/files/file/fepef.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/wenura.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/lidonebojojubomojasaj.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140514ebaa72---nadovorogu.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/vagefogudetevufunixuxovaz.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/71665012946.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/wekaferudijavivazaxisulot.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/9267458805.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/20840340117.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96fcirm1uo5d99qq32bhkn99k4/wexuv.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429e6027daa---revotefuvera.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/fogesiwutawar.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/sunukuxefe.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/kumizopixuma.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/57984919626.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/11189968031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=can+you+transfer+icloud+to+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69E 17200 bytes
SHA-256: a746ef3c93e19c5cbaad910de81edbe55a82f1b0010406a22be04dc55467c657
font_01_sfnt_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 10712 bytes
SHA-256: d03a7f942651ebc230bb34a2e8175dc5d50872bad1acdec65aad1ac9592e5b97
font_02_sfnt_off00011b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4D 17140 bytes
SHA-256: 45968dceb6c9e927d80d4820a5a284c4377c751aecfaf50ba5ab81e8306553c7
font_03_sfnt_off000134db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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