Malicious PDF — malware analysis report

Static analysis result for SHA-256 caaad5ebdd092d75…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 05:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9053656b7d4c05360dffbab6eb77a8b3 SHA-1: 008063b6b743d1878d6b6a3e12c4380b122e8877 SHA-256: caaad5ebdd092d75fd1e4ed8f67cf61bd2696cdfae0d1d938c8a9fa66b6076fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it is likely used to redirect users to malicious sites, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=genetica+de+poblaciones+hardy+weinberg+pdf PDF link annotation
    • http://kinel-hunter.ru/upfiles/file/denuforarubudubabofivaw.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/73426547929.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7342a58762---44387203096.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/52557594930.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/42686805951.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/15b61ba3c33fa64387acd7e6116de14a/17607994608.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f359a45242775b0ca39f996127304408/kisov.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/kefaparorazinem.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/jratj9vooji1kj618fac3lkjo6/30106771391.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f51f52595f2cd0e30fc7a9048ff551ae/62794246748.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/cvu9mctm5fuc5k4qu1e2q8tu0j/nefajazeludeb.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b50e3146---31651800203.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/5085459688.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765d8543941---xojegixigosadelep.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e730fad19d7---33236142818.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/88600474349.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/roxof.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/xedavitikidu.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/51396729870.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ee71b81efe---valuvekifojedorani.pdfIn PDF document text
    • http://elpijisystem.com/file/79131779064.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/24171749720.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/nimol.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/25363485629.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/kebavugusupazeremet.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_off0000c942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC942 19440 bytes
SHA-256: 22e8b0a45e3f414e73d2cc37deaa153978472f3d1cdf4c16feb4061c8370f990
font_01_sfnt_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 11276 bytes
SHA-256: 0c5aa067a1ccb5329894e4befbaa6d97a30a6bdb973d7a78420eb82c3b8ee587
font_02_sfnt_off00011591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1