Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b929a66ba47a362…

MALICIOUS

PDF

113.0 KB Created: 2021-07-03 18:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e73774d8dceddfec1e435a443f546ec4 SHA-1: d3387fc9c980a4213f07842919b70a861c2fb240 SHA-256: 2b929a66ba47a3623297260430194ac1ec69877df29acc6ebdf66d27b3d649b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is intended to redirect users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=curative+resection+meaning
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/6b8f8dba679e4e8be08912742d9ff24e/fuwiwuborozatirazo.pdf
    • http://kraski-chernila.ru/resources/file/20896005938.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aa4bcbd9c---saxuzilamefiramudajasi.pdf
    • https://bkht.vn/userfiles/file/14297254517.pdf
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/22955326952.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ustim6b2l19fkrf47a1khhef63/18582463432.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/b26e10dc69f1e1530d41a35d56aa324b/jetivef.pdf
    • http://amphorabeautyclub.com/campannas/file/95912860763.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/t0pniprq5keid9oqf5c9d6ka7i/xowepu.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc5a845450---lofunetunafasefakoxexogun.pdf
    • http://xboxheerlen.nl/userfiles/file/31545060129.pdf
    • http://interno-kazan.ru/upload/files/xitip.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160839b9e138a7---9241515810.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/eaf11fcd875b66cb8ab50d8ffdb78129/80900527042.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d49358571bcdd77148e2241d59f8eb94/28536634020.pdf
    • http://cdkkck.com/uploadfile/file/20210617185242.pdf
    • http://ahkkpcm.org/userfiles/bovepuxurora.pdf
    • http://cedule-plachty.cz/files/file/75712708178.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fcb2a534---fajonuxorafazakabosurut.pdf
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/tuxagevakijunukogemuri.pdf
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/2c344569a54994c67ad31e20b48b24dc/butezadodez.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dac18a4b0.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/4f53fb04ea1cd99845992b464cf65c63/gored.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000158f5.bin
dea7f036f23ec5127535c2d0c37b5c4402b2e7de9accbfbbeed90e8924dd91c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x158F5 17300 bytes
font_01_sfnt_off000185dd.bin
bf993239fec4e1526d68e5c449e309f33f5f1640fc55d048f5c7bc0b76cfc511
pdf-font-stream PDF embedded font (sfnt) at offset 0x185DD 10724 bytes
font_02_sfnt_off00019e96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19E96 16792 bytes