Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6418c50ea55345…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 09:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a1d548b23832c743328ac985ec521e8 SHA-1: bd35d047eeee0a7241fbe5263fe18dc242a593ef SHA-256: 7c6418c50ea55345371419f5c04b06dd1822cdfe5e81583ba18614494684ad35
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, directing users to external URLs that likely host malicious content or further stages of an attack. The presence of a visual download button lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://oniceh.ru/uplcv?utm_term=internet+download+manager+silent PDF link annotation
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c265d48165---73075797986.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/41467575040.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///xatelolobuwanuvumuja.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/50705084294.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/nudisosilafekipexonojon.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/14990040526.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3bde324d---bimoxufibemek.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/runalovelewupomomafuxidon.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6e1dd32e7---98313350629.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/13647142782.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/gobev.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/25746633a7210d2dc679ffe8288d3549/7270902563.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/62901100180.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/fojusopefifijedepuwore.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/sugaxetovizafozusasasuzi.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/9671756642.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109070931256538.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/86608705782.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/sipebobaxugebusuvakeboxog.pdfIn PDF document text
    • http://dgjst.com/upfile/file/kadufilozoxerugivefipami.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_off0000c97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97F 10628 bytes
SHA-256: 95ddfddbe284cd475685b3dd25580c392c5d933ea32c8a3b7d137661e858a92d
font_01_sfnt_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 17552 bytes
SHA-256: fe824f757dfdc28b16e9dc7a0faedbf57984fd47557c71eccee390f1c7c1a45e
font_02_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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