Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ab817ea5c79aad…

MALICIOUS

PDF

92.4 KB Created: 2021-09-01 08:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60aeb005374356a7d9a72b9540aff59f SHA-1: da013becd71ac8f63f64ea1980bbb9a6bdf7ef6c SHA-256: 95ab817ea5c79aadbacb72703ad022bd7b18c6015a49c0e8bed9cc458d49c005
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple distinct hosts and disposable hosting suggests an effort to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://xn--or3bi2da319p.com/upload/fckeditor/file/rujivipoguk.pdf In PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7b1530e0b09211a81647838eb36b4e59/kavexafedokawajulizowa.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/e49s1fql4vauj9ukjegtpq0281/bedurarozepimiruv.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f9840f8b58a22eaabfcc241238a5184a/jufigilozaxebamanop.pdfIn PDF document text
    • http://babamoleskine.com/files/file/godamatojepom.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/mutixurizul.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d74e91971b4---26791191504.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aca05ad33e4---rimare.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607161654a250---mamibun.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/jumok.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/52708526273.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/32c8401ea6a965470fd92a38b03a82de/zixefi.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b680cf926---37792941793.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0368e177f3---jofasexunasiwobosojid.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5206d090efeb6920649397efa5a1f07d/29448413150.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/6699e6394cad906c9a54537284590308/71177542246.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/pozut.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4544238b4d---veduvitumajaduvigituzoman.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/52053709490.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/80144267131.pdfIn PDF document text
    • http://signauction.net/userfiles/file/lawanunuruzuzum.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/20223096454.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/64169776541.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/petibojezusoraw.pdfIn PDF document text
    • https://latework.cz/soubory/ponojojon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=classic+wow+mage+pvp+guidePDF 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_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 10836 bytes
SHA-256: b6df543cfa618f1600b1f62f69a7a9f658902ec1c5c05d549299f00c71760ffc
font_01_sfnt_off00011cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEF 17900 bytes
SHA-256: 61bf748e0bedadd4e5851fae9f2d2e824b3a79a6aa89184c2c4ebaf0b1e2e169
font_02_sfnt_off00014b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1