Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d44b20c824a60e7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 06:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b9b304251e3ddddf8e83b3af81e4610f SHA-1: fcc7a3d9c69a183277c036cd04fbc58d53025e4c SHA-256: 6d44b20c824a60e70b856c7a786563ee4838980d647a2ee14ab6b86721655294
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://terfigyelokamera.info/files/file/darijuwaf.pdf In PDF document text
    • http://www.chatanakonci.cz/userfiles/file/paxitejoxadimiw.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/punelebalopesilebakukowe.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/ponabajomebovokabemidokaz.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/11602545464.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/fd344abebcdec02334fff41da8449fad/tidulunu.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/32050439033.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/sifixupoxefivufijinex.pdfIn PDF document text
    • http://methese.com/upload/files/93053275463.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/53043667295.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/78650955227.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/68623819757.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/49218090096.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/91029584101.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/39334482256.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/jesosufes.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ccfb45bc4---rutebu.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fubed.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132030ba134c---zipanikojedoto.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/29876141124.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/viviwezogusazejenubafelo.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/nazegugak.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/24431661585.pdfIn PDF document text
    • https://arerp.kr/data/file///42887511961.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/simepotaxewesaxofejadov.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/jadodakegitot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=zee+tamil+shows+listPDF 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_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 10216 bytes
SHA-256: 7875638b8d9bde88b6f4ea9e52d270a43134895850bab6b5ed74e8648bc0793f
font_01_sfnt_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 18756 bytes
SHA-256: 563944b6446bd2c7fb1e5cc0ea5a89a9fd87929125275731efa58bb9bd57e1ca
font_02_sfnt_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1