Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb45fac440aadeb…

MALICIOUS

PDF

84.1 KB Created: 2021-09-10 05:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b819b8965d05060694382f8688171930 SHA-1: 6627687e19eba488ad165da4f0dd39cc8b0b907c SHA-256: 5bb45fac440aadeb23c07e737a4677ba2beec789c2321b0030f9f9a3baeba573
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing unwanted software. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pistant.ru/uplcv?utm_term=imovie+free+download+for+windows PDF link annotation
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/34180643745.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7b096kutk5fmret60kb3fmsu04/wewowogupolim.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/63519844922.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/42226701275.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/pufupinoto.pdfIn PDF document text
    • http://tercovci.cz/files/file/52939156622.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/92363060780.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/23870616982.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/povutuxeroxo.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/lugesezerepaxubusimesika.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/23636568665.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/fenufuwepuxosu.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/19714077130.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/34528105345.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/10913767169.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/25467993599.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c90c2c05e---dapitavaniguxiro.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/lifuvomonenofofitilixugik.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/64905968230.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/62469278327.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/niliwarulutevuz.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/80952450599.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613083689e42e---wefimukeseladajige.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e26059e05f45e3bbdb78a3fa1fbdbb76/27262286138.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ef407c7c81ddbf776cecef6a701207ae/duruz.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/45998268847.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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 17800 bytes
SHA-256: 697bb68969b2279b696dcb890be28fa97207decea69704312e6d362400d1cb60
font_01_sfnt_off000112af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AF 10520 bytes
SHA-256: f9a7adb7fc6a5826d096d2da57b678306b00ae607c9cd6770dbf353e7f380d86
font_02_sfnt_off00012aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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