Malicious PDF — malware analysis report

Static analysis result for SHA-256 db21bfb8023adef8…

MALICIOUS

PDF

79.6 KB Created: 2021-08-09 15:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a2c2c399b9bb35a69a066aea8702c7fd SHA-1: 9b2562f72f00cd885764df1fa2fd1b1891107e4e SHA-256: db21bfb8023adef860ef916cc0434d4f5db1b0a49eb09d24265e9f714c315f0c
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic to bypass gateway scanning by instructing users to download an archive and use a provided password.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/datuparufunigi.pdf In PDF document text
    • http://hrt-foto.hu/_user/file/12235167390.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/36917299157.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ee9dae37---21356057226.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fjdkgvci7bu9u4t1gjle1m1ttr/gokapifilozazataxupe.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/dawuvaxuxogolijakeno.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8f0cc334---37465633136.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/72289916153.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609afdbe2418a---botibok.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/24a78fa45dc1903d8ac41f75aef6af19/67220179880.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/zilidusobovap.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/28378156650.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/24653627052.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609681781c858---31697732486.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/23613917899.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/343ab4bd29f6f074313e0dbcdf1863d0/82641699704.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/19114316131.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b78dab79d---mixodavenoninepugefazupir.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/vijotenuzobifameruluz.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/ff3b5a7f201732733c2195a4ffd57ef2/luxebujixed.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/c69fd761b0141fb38d835db8119d3e2b/punikug.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/f27363fe18a1ff5af64f467083e37b3e/32308665592.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760c585b4da---55203217985.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/letububolazuxaximi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=best+game+hack+apk+downloadPDF 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_off0000d2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D0 16972 bytes
SHA-256: e0037bdcee4ccd8579b7ea2a19b060ed6adadebb2a5916f4111aa7015e8f1f7d
font_01_sfnt_off0000fedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 11000 bytes
SHA-256: 8c9f98f6a99a6140b58c606bf61a06d9634ea63c9870585fa13abedbe3400605

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