Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7cdfcbf4b576bf1…

MALICIOUS

PDF

89.2 KB Created: 2021-09-09 16:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed9d4ad8f5f7aa1932e920caa7df2ee7 SHA-1: 1f8e98d71cb4af227eb8123cb28eb2e492638dba SHA-256: f7cdfcbf4b576bf1377222abfb64bfe95064412e32144e5633c1adcfab86b19d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://oniceh.ru/uplcv?utm_term=como+eliminar+publicidad+de+mi+celular+android PDF link annotation
    • http://lnhaihui.com/userfiles/file/20210901095107_1964639482.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/fujibibanimofebofigasadul.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/97675672735.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/77499264390.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b759818fe---89639152011.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/fitoxunedepixupigojum.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/67601141682.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/163094736050798015.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/66786361865.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/toditeliw.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/fudonarelo.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/23937584833.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380555d7789---tasinuge.pdfIn PDF document text
    • https://ebooksweb.net/files/file/sosusosiwipuza.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161396f733ac8a---69700854464.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/jaxuvubane.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/rozamoxoxogesaxanuxowi.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/91460652519.pdfIn PDF document text
    • http://kaies.net/upfiles/2109072317146850013egb02.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/renegemejokovukososeju.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/tanapediwibipogumolokamok.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/xozifol.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/12860859527.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1630654342/file/11846017370.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/96559095796.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/46270886387.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_off0000f5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 10680 bytes
SHA-256: 1f2d12f0349fc711af7df83a871c40e03c9bc3d3d45ba9c6f4c8d0bd4a71897b
font_01_sfnt_off00010e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 19084 bytes
SHA-256: 27a96c4e4ba76d8b2b49f43fb349bc1391f2d901a5e362007f10ac07a61014c2
font_02_sfnt_off00013e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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