Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d45162ede2c3e51…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 02:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4cbb26f7342a79c6efdc3546cce490ec SHA-1: 8a1569dc79d56c04db3fd0044de6204c43f0dc36 SHA-256: 2d45162ede2c3e5129a78b4981af192e820abd6ebbb287b3ba50ade9adb98276
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or exploitation process, contributing to the overall attack pattern of distributing malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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.
  • 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://archism.ru/uplcv?utm_term=slime+rancher+android+gratis PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335533ac419---12213319722.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/54345028845.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/xoririne.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-4/20210904004722449430.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/3722d71d120ad108d6cd2d0985f0628d/wamupizatudutusifip.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/33043525701.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/baxinowe.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/16650547336.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/14876023740.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/fatedemujiwapozutoxemipo.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/tuwoluxajipowival.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/70956879501.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/gaveditotigojojil.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/54771306360.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/tiditumesa.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/88799269807.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/141f21660334e85e59b61c180f141ea6/3958018975.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/nuxesatedekapubonugu.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/28221989415.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/topumekipujadibodaloku.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/zaxivifesixopi.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301877d9ae9---34045139963.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/46831150262.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_off0000b17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17C 16084 bytes
SHA-256: d8a0f4d5f40bcdf803d7e247efd3729ce8746e939e3f55cdddb6f589e6048901
font_01_sfnt_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 10892 bytes
SHA-256: 652d5c6a21f66335b867ca4c3322ca617c7f01aebeb60933db0efa2cf7a02770
font_02_sfnt_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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