Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9521bf58b6b9bd8…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 11:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19480a755eb43b4350e598188afdb676 SHA-1: 45875fc7161ed78801dade1467b76aafa44bb1a4 SHA-256: e9521bf58b6b9bd8931538ce876f49665bac2890a6d06f36c8f69e4b081cb82f
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, suggesting a phishing or malware distribution attempt. Heuristics indicate it's a link farm and a potential download lure, with ClamAV detecting it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The primary goal appears to be directing users to malicious content hosted on compromised CMS uploads.

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://drafthe.ru/uplcv?utm_term=telegram+call+recorder+android PDF link annotation
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b97feb67cc---kivobagijiledugut.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/2553586658.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd4db916e8---51680602225.pdfIn PDF document text
    • http://allasclub.com/campannas/file/limubuwakefiwubepek.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/kulawopepubikuloninub.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210920150401_gek0ag.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/mixari.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091619194470554.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/45667205783.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/51929647265.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/14467109742.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/595dc0770769f100236d4e368904e7bf/51329066586.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/ruputuwa.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/67692622652.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/lupenisofebesup.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/d6a6aaeeea32e8c49a5c07f7dd6ca2af.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/padobawibojajirizodizefis.pdfIn PDF document text
    • https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/xoxolobemulomex.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a6f45ef3f---65776073543.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/25607727545.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/dupepedobelikisilow.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/belilejuv.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/13709282072.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_off0000e39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 10412 bytes
SHA-256: 67b983230a7b96e3cabb2620d655f398b72a07bd6cf869eba9f6ccc578653078
font_02_sfnt_off000112ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FF 18240 bytes
SHA-256: 4b776e13ba533b1f5cc570536f3ebd8c1b8a3cf23cafba1cbba786f459f10d85

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