Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ebcef9a40a1e56…

MALICIOUS

PDF

85.8 KB Created: 2021-07-14 07:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c08886c6b45109c55c98f80780208376 SHA-1: 27d03e4573eb96bf392877c2037bb16f2005f285 SHA-256: e2ebcef9a40a1e56fe56487390e0d030845908640b76c96b4d3c6821d92c8940
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b4342b744---28826102805.pdf In PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ffe7c8387---wojusajujaxaloxeguxe.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/14933273450.pdfIn PDF document text
    • http://orlickachata.cz/files/files/78607462456.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/xalezuzufusufikinis.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df9b5a4018---84943361885.pdfIn PDF document text
    • http://kotolantopeni.cz/file/47574014122.pdfIn PDF document text
    • http://bptramptour.pl/files/file/1630899780.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/9789227777.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a412286e79e---xexolufigodegusotij.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/vijefakojoxetojenig.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/robatametevijetikovofi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7qjkd9euapep6bf9amgkias3v6/remir.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/palarejefi.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed385cca9c---sizesezozinevibikevugi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742e708d116---xowapesa.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/lowuk.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/11620451298.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/29406366777.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/83fd30e6163229bec7ab7f042b6f13af/fixolunilemudoliwukitope.pdfIn PDF document text
    • http://scro.ru/pic/file/45740862362.pdfIn PDF document text
    • http://isgsrl.it/images/file/70778619164.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/sinebajareguvidolaw.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/aplfkl26s0j6jh6h56bek54ova/90569263045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=finance+exam+questions+and+answersPDF 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_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 10896 bytes
SHA-256: bddb089f76eccdaaa28697810d8812d292ed89e88f04aa9d2b8ebe1146fcc2f0
font_01_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 19540 bytes
SHA-256: a0e6f2bebfdf6f50fc4daa263cbc8c69f0ea90ad724b51b1d3f016fe86974f8e
font_02_sfnt_off0001319c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1