Malicious PDF — malware analysis report

Static analysis result for SHA-256 63215c6b8232a629…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 02:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 41040399e79eb294b8976b7ac769b1a0 SHA-1: 4de91e58b57767ef16e10be99474f14909d7fad0 SHA-256: 63215c6b8232a6291541439edbc6aeaac7a3bd8d9e4e5806fe0e5a7a85276d6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, 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. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=present+continuous+negative+worksheet PDF link annotation
    • https://hitourkorea.com/FileData/ckfinder/files/20210714_97716D3F3E4A2018.pdfIn PDF document text
    • http://mousike.it/img_ins/files/77663798038.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/zubamedowononiwekiwede.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/bewev.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/mugitenumabupefojosi.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/39787b9159f2dc41eddd93b34effe8be/gonazisoxo.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210825205732.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/norupopidamuvovutidepat.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdea0857378---dadesibuzoware.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/sakivikuvafanexut.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080361680f96---pixoku.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef4a69185d---16706143952.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bacf337686---zegilekiz.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0875113e4c---54170435944.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a686bae164cf1d62c7a7e2c02fd95dc1/17438373510.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210720_153233.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/notizuverupewez.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/55422612556.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/dekebak.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/82169160039.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077df42f363f---dufuzefilubirekad.pdfIn PDF document text
    • http://jar-ted.pl/file/57297506882.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_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 17968 bytes
SHA-256: 6e704209a35e59ead8e41cf736e4ada02ee9106107d33908e7fffd6ee931f52f
font_01_sfnt_off00010343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5A 10808 bytes
SHA-256: 489a50cda075acf1b2d9311552086cdec63f146829dc626f4b99d7a230d192c0

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