Malicious PDF — malware analysis report

Static analysis result for SHA-256 93044dbf61944a37…

MALICIOUS

PDF

75.4 KB Created: 2021-09-19 19:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc5b840269a7bd75d6c50d5877018cb7 SHA-1: d86f0fae22c4c81908607e76cc9eea1b98ed39c0 SHA-256: 93044dbf61944a37045a9d6f78cf171505a43a26cbac582ecf3dae61f98b03e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, many pointing to compromised CMS uploads or disposable hosting, indicating a redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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=amazing+spider+man+2+java+game+download PDF link annotation
    • http://isotope3.pm-ural.com/uploads/files/93436732490.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/86887806049.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/bezujedoluraz.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/dakekis.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/dafigepipurovu.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/63818845523.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/60181838098.pdfIn PDF document text
    • https://mfdesign.hu/files/file/bakara.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/3896549249.pdfIn PDF document text
    • http://vhz.cz/user-files/55840201388.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/90904001124.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b62983eec7---80049803508.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210919/files/20210919101102.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/bojezitobokiginefe.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6ad0cb5bd4ca9c4a580a5024d003529b/11953683054.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/73778412214.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/26536942136.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210917091844_655e4n.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6151428451.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/82448843006.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352e4c6bdfb---ratobakapixofolibenu.pdfIn PDF document text
    • https://argumentua.com/i/file/buripanomugidi.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161458ff2cebd1---61996393185.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/popew.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/fazedekunav.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/53128114364.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/6709d72a952f936bb852b82a4b47ed58/62491848212.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_off0000bf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF49 11080 bytes
SHA-256: a2c1df52f40edd054d6e62597790a03c9940d912e322b54559056c663fd7a3fd
font_01_sfnt_off0000d8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 18052 bytes
SHA-256: da362fa8cc840bfcc04219d7a7c30ed1a18176f23d3f6d98743903c5f455b741
font_02_sfnt_off000107f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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