Malicious PDF — malware analysis report

Static analysis result for SHA-256 89dd4aa2c7b46654…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 17:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dcecc8cbc8954842a3fe9a268e67c0fe SHA-1: c011580f9d21858f52e1f5c66297f273179b1da4 SHA-256: 89dd4aa2c7b466546df29592984efaf7d2817f86dbeae20b347eb79108858e6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=t95+android+box+firmware+update PDF link annotation
    • http://dastone.ru/userfiles/file/937115501.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19814999267.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109092229373926.pdfIn PDF document text
    • https://lecachet.fr/docs/files/feresaperap.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/33930942679.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/mupagijiziluvumidupo.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/sobuxijuvikinolaja.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/8300412335.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/19976181670.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/botukidovogeti.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/38798351735.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/gabiwiletukapabovixoda.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/28187452257.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/jilokufaranufu.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/kowilurunel.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142afb50e246---32417399922.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/60529545644.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0dedcbf07---29114404398.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/3c6gsh3pcdfmaoi153jokcp7b3/jizaxix.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7d23004525257ed2773f0906693ce7fb/7233878795.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152668e65afc---71318007956.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210921050955.pdfIn PDF document text
    • https://sjaindonesia.com/sitefiles/file/93107169461.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/jewojas.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149e04788b7e---digosagasomaxagef.pdfIn PDF document text
    • https://flyags.com/editorResources/file///mukesuge.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_off0000b5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AB 11140 bytes
SHA-256: addf29542c8ffd031626c8ba7ac89e2e5e82af71d7dcaa1c11efcc448191a5c8
font_01_sfnt_off0000cf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF91 14300 bytes
SHA-256: e0968b706cb2b7766778e75dd70d1a53923773ef6b4194f3fadd1ed54112dd91
font_02_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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