Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4da88b898db37c…

MALICIOUS

PDF

73.4 KB Created: 2021-08-22 07:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c6e822659df31cc5496a1612fb7745b0 SHA-1: 0a6cbd68c8ae9726e93b12b97a782dbb720adcaf SHA-256: fb4da88b898db37c1d07e3f0ad5c29cd58f17e37237b188acfbf7044c474b574
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites, indicating it functions as a link farm. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4113

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=how+to+start+a+compare+and+contrast+essay+intro+example PDF link annotation
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/lokegipal.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161014a6377762---jutozabibixo.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/gupefepaxizedam.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/5692561667e0397d24ccf0aed04649e0/xabaruradikotodekujo.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/cf6ef69911b2d4632ce2122c60d1f1b8/voref.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb07edce3---62624692763.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/19817391676.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/40827700269.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/53996990411.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/45490251187.pdfIn PDF document text
    • http://parisplaza.net/clients/3/35/3561a7ce45da2f2f114a98ea6175a4b1/File/meziv.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/6232492451.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/530f3d2d138e9ea99064377afec43c83/29854354366.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/rjc2obaeo5q9e3bmmjsb4qgi73/56959966268.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/pidagude.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/movazopiguretasefexisa.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f2821bd1e3b79089c46cee86407f7713/limikonafu.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/5690124622.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/xigebij.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e1fbccc8a5395054eeaeace7912e07e9/wazejirite.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/17/file/20210517_231313_164.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/sejukikekamig.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da720c8470---90255063002.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3037b70834b1229923f832b8304d9ba8/zoliga.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 16768 bytes
SHA-256: 99c1a93567af1aa8e50a277702878e4b743bd6ac64914955f757b707eb637092
font_01_sfnt_off00010bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD6 10968 bytes
SHA-256: 321c69a50a86f8f7e792cc88172452845c22ae621061fae05054b1e467fc15ec