Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b59a5f19ee12d6…

MALICIOUS

PDF

97.7 KB Created: 2021-08-14 10:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 0e96878dae41a8f6ab0e062feaae02f4 SHA-1: b8d412909c95b7dd22300d49c6795f1646fd4346 SHA-256: 54b59a5f19ee12d6831805be1d08c378e444edd2c996656acc231cab3e00b40e
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zegabilisim.com/calisma2/files/uploads/fikitibemilubolapokowa.pdf In PDF document text
    • http://urgentcarepb.net/userfiles/file/bojupukumurilajiwipusiven.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/2200396428.pdfIn PDF document text
    • http://bdn10.cz/files/file/zilabibizigozemuwebuli.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608556f49e53e---72522102641.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/sikekeju.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/17cc643b2b91cf08fe894382bb6992c3/53005657283.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/tigejevone.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/kokarifazeturozawir.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e557236af51d762ad4b601c0d64937b8/vavuwonubasizibixatejotil.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/c7b0711353357e39385eecf0b93d89da/86424379027.pdfIn PDF document text
    • http://imi.vc/upload/files/juxobaritinarunivetuxire.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/98972158178.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/zuwexezaneziwulazerasa.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a2ee94619---dozedixijituv.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/wugiwiwoditeloxebonenif.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/55256911158.pdfIn PDF document text
    • https://istanajp2.com/contents//files/furadirepakupegogibulobal.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/62395362021.pdfIn PDF document text
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/juxusuvovivuporifar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+write+functional+specification+in+sap+ficoPDF link annotation
    • 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_off00011a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A49 17604 bytes
SHA-256: 04a2b3466665e6f26d531c0eaac8bf5a456a7b01717527d71f3bfd4ad1374b9f
font_01_sfnt_off00014826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001603d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1603D 10648 bytes
SHA-256: eaf5295f218e42108516b43136e197fb79178002ea0948cb693bb09a8b3a0e7a

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