Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e688a97970a5b9…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 02:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b93ddbacdb9740e7dc38a60f734ae6b SHA-1: 510c5cea1b565aaec125fd56ce21d7741ce15438 SHA-256: c3e688a97970a5b9f3a2931edb09b1aa758c01419daf2839db66302510e11bc7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, potentially for phishing or malware distribution, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=bhai+the+gangster+apk+download PDF link annotation
    • https://yourownadviser.com/ckfinder/userfiles/files/tupupu.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/wulunibuwigunepogasopi.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/18030644670.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/bamebejuw.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/56684419396.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/37915290491.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/tagejixejoj.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/kupododebib.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/dosalovevasepewowefezi.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/88408069555.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109100056277581.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/gomevulavawepopetod.pdfIn PDF document text
    • http://orenprom.com/img/account/file/90571236600.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/16812731107.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2beecfe87---13580268939.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b500ac10d1---13623497011.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/28074760412.pdfIn PDF document text
    • https://vleek.com/uploads/files/gunizezadilidiwat.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/bozijofupudawib.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/gasulegejatomaki.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/34311749114.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/gowobaved.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0ac3fb84---metiwusifofutabasimamodof.pdfIn PDF document text
    • https://anjingliar.com/contents/files/19422716533.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/85323152852.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_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 17704 bytes
SHA-256: 2c0f75194bf79e9a3873d1733b271f9c245a4fb72d48ee851ebc1238a97a65d9
font_01_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 10904 bytes
SHA-256: 005cced94ac5d5a4cf5aeadcad044dfb68b3c74cdefbfdabff9953286865a720

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