Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e0897b674c6d1e8…

MALICIOUS

PDF

70.5 KB Created: 2021-09-02 13:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7bc8f39846a37d496c0fb470429e2a92 SHA-1: b9974e6a37ce819a25dd9bb43e8dad2c14801b00 SHA-256: 9e0897b674c6d1e88ed3eb54fd0a18ab4a826f1adb8d8d81038dfe3d769448dc
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a phishing page or a second-stage payload. The embedded JavaScript is likely responsible for initiating the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=destination+b1+pdf+chomikuj PDF link annotation
    • https://cpc-serbia.org/js/files/48442099147.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/63760ebdc7bab451608830125b5b298b/dulafam.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2f3d62c5---xisokisuta.pdfIn PDF document text
    • https://andana.us/files/files/43515670264.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077f2f2b7a4c---kejenesitajubi.pdfIn PDF document text
    • http://tfforming.ru/d/files/56510033098.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/vukitaw.pdfIn PDF document text
    • http://ranch.pl/files/file/98450186029.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/78035374586.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7182fb463d304341c7fd59f5e3cbb1e4/23848450495.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/gawejofifilopivuvi.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/vanazob.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/pazojobum.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c1fef10fc3a9c1a3f2cc7b3f8cab0746/gesixipapakufaxutid.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/86e01e841ef379f3bd748ebc26e18dad/lerukadazis.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608deaf8bd67d---kuserizovivalek.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/70a8d92449511d6468bc282948bbb8d6/91639508995.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/28228233102.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ec51a932fa017929d1d81dda0b00159b/23870819321.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/bunuronefuxe.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085529518353---tasalerurafagub.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712bfc74ffc---33439570604.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_off0000b4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 11252 bytes
SHA-256: 61b33d81cee97a6807623b849917473b559c283ff470180d95564d666744dbfc
font_02_sfnt_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 15144 bytes
SHA-256: 4ab7ad27e85cb1b3721dcae5bc92ae33f81872ee57d8e6a8b0449b4704815815

Open this report in the interactive analyzer, or submit your own file for analysis.