Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7763f75be94fd4…

MALICIOUS

PDF

85.0 KB Created: 2021-06-30 01:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c1a0af8fd7a1754952dfe3435b7e493c SHA-1: 078b1019e7c15f3eaf11b143a2fba320264354dd SHA-256: 5a7763f75be94fd4cfa44007d836514dc0382682cb37f4b6d9de9bf47c94b6ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised websites and a visual download button lure, suggesting it's designed to trick users into downloading further malware. The presence of multiple links to compromised WordPress upload directories reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/061f74a13260e51c9050244253247dd4/pelokof.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e817382768---56471738850.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9bf614c88b708f7fc306154707f07f52/lusixenivopepilopezifubol.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091627b4ba23---tilovuxojilulikoniwekina.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/7750alv1tgjlpjo6g48nrp51ju/gakujepof.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ri8o0mkq4tri83uuh9k5i00560/bixerafezor.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb0f22d42c---64729886640.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16097c873b90f1---47816489560.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050111095656.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b3b79f424---lizelunaw.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/11510529447.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac20840773f---kugotutadirekij.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/b8d68cdd485b9eb121487b35034730b9/silegofisaxe.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/bab9403d980cb7d9127cac3b171bdbe4/nogafimumobuvujewagi.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16082af872f2d5---javukurasusivexolazi.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c9faa602e8d---voruvirosobuxawujeni.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/sojogalitebovezanugup.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db9b8741ecd---limobanenotemosigisede.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/89923975333.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1624507265.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c9e63b8fc8cfec1dfe789c86ccd8dba2/bipif.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/luvadifenuposak.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/pebakesuxovosixir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=rd+sharma+class+8+solutions+linear+equations+in+one+variablePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/fc9b00659948757d95d5e53b9678e356/69510500693.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_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 11340 bytes
SHA-256: 21b102f8c4c4fca312f61b6a20d21d17d5eb2e7863601fbd0d90a8a184d57a8a
font_01_sfnt_off0000fd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001158f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 18004 bytes
SHA-256: fa888a47a067eec8d687be781c684963726562cf3f27520b9cb0fc7fd64dc27a

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