Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd64e106f85a640…

MALICIOUS

PDF

88.2 KB Created: 2021-09-13 03:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc03253f62a99c00dcee54be94827e91 SHA-1: d5ed3bf782c987db9eb2d922d39a8aaa320fb914 SHA-256: 4cd64e106f85a640d8a9ce4d7506f3651305bf2091b9fc594a1c522dca31541d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=mx+beta+apk PDF link annotation
    • http://www.neoneofitou.com/ckfinder/userfiles/files/bulevubajafojo.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/3680497625.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/65845289884.pdfIn PDF document text
    • https://5udua.com/contents/files/19347415678.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/96144999da9c2e81a856c5462e8e922f/78160073039.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/visukizitifovugajak.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/80878981210.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/zogewirinug.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/58228264587.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/82339188905.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/64838127758.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/risajugu.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/barufalobogemaxuvus.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161313357edbbe---bojid.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a277d9087e90e267700fa0ffb191a165/37449566014.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/85446448959.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/pabiw.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/zusefimuvit.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b0232800df1a375e6adbc3a9d507b7bb/7494320319.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/xumenowuzefub.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb16aa97a4---24234164253.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/valojozexobetivemamefom.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/95510994960.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/83426724173.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_off0000f925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF925 9944 bytes
SHA-256: d5c34e26d5731a0045fb6d7cdaa4c08ca503db0590e2e252d108cf91ef15f1e8
font_01_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12722 17088 bytes
SHA-256: 512d07c7034a1846ded793da04d9e0fb0cb29cde0c695bde492797e5c652a4af

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