Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5eb3921a2e6e4f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 14:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb59dc1f0a205a64caa34dacfcfcb6e7 SHA-1: 476cc9c86d85f097d067130fbed41b0f0a244629 SHA-256: 9c5eb3921a2e6e4faa6fc93ec6ec2ff6d3ac2a17c01bf13554e44ea43510a164
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://crewmak.ru/uplcv?utm_term=what%27s+tty+mode+on+android PDF link annotation
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f97ba56494---96793100861.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/mikutubikekuvinowoderiz.pdfIn PDF document text
    • https://venus-forever.com/image/files/kenolapor.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/73040852004.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/rutagodibesadaninosi.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/vapubuvevulijixukutobis.pdfIn PDF document text
    • https://luminex.pl/upload/file/relujofedipikugat.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d77a8b9f7---30612817341.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/wanefisopifudexaxugi.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/bamidugobotefelet.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f20a39573---vemimim.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50369778890.pdfIn PDF document text
    • https://susta.vn/userfiles/file/jijerukebiwepewemazuki.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/wezede.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-6/20210906135627341419.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/846d9b21c7839c8685703441365f6335/banofa.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/73245363223.pdfIn PDF document text
    • http://mayjack.com/upload/files/kozigupebuja.pdfIn PDF document text
    • https://webrobogo.hu/kepek/begokonefakomu.pdfIn PDF document text
    • https://makenie.com/upload/files/zelukufe.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/fumajax.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/torotezil.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/jusosigubet.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/mupifuzete.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/risutadef.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_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 10608 bytes
SHA-256: 84d543eb7a254a468456228f0f74f15329e53684a8c7f551b41d4a19b4c17f8e
font_01_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 18288 bytes
SHA-256: 4662ac7d28f3134ee185a35bb6b509f67624bf08a4c1cdc12d287bcd19b6bb40

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