Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a69b72866647a2…

MALICIOUS

PDF

76.7 KB Created: 2021-09-21 09:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3d99986893548d0a43e00f8200978db SHA-1: 3bbcbfe4f8fc42a7a7335afbad800d3b03364c1d SHA-256: f9a69b72866647a2105a15461f3a90a4af19d6f145b54f6e594168f6207e8461
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16149807c69bd4---jelarow.pdf In PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/93899196161.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/guravenosizur.pdfIn PDF document text
    • http://adice-area.com/pictures/files/60935168801.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/dutosumefidejikek.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/98534157936.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210910130541.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/19508427599.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/6435663377.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/funalanudavumutoxikubedap.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/netalupitulubalewudevoga.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb92babda---89786806718.pdfIn PDF document text
    • http://strahyi.ru/images/file/xalitewoguwuxugavuv.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148e5ff28f2d---dudepijezog.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1a1aa3180---tizukowibipaxegoxa.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/girarevimalixu.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/96682593970.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/retoxamisudibiwagu.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/fizobajemipabobapikoxekek.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2f630e67721a25264a7cf0d40c760257/8763175722.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/rogoxapisemu.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/nurupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=netboom+mod+apk+unlimited+timePDF 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_off0000c84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84D 10596 bytes
SHA-256: ff86cf18573f78644eb10e2ee358069231c1aeccf4e5feda24233a60e80ca4a9
font_01_sfnt_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 17304 bytes
SHA-256: 63fd9b7635aaabd776d2eab82b9e9d764dde09f1413723381c48fa06630937a7
font_02_sfnt_off00010ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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