Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eef661aa64f32bf…

MALICIOUS

PDF

87.2 KB Created: 2021-08-01 05:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9dcac8db8ba2278bdacbfdc9cf268a14 SHA-1: f649911457a956cdf40e0bbf3f92b214d931fe26 SHA-256: 5eef661aa64f32bf89abd8fca10a91d9e9cabe5eb40c973405f6e4eb0b92f32e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9201

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 http://liyangah.com/Upload/file/vasoribivagifugezonaredir.pdf In PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/zajinizowekeretofa.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6158dddfa4c461661a36ce7456492bc2/68349993503.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607844ba1ffd3---pexeres.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b27dba30a---rezorejogijibejigosor.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021051708343619.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf07172edb---24424961266.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210726_201443.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcc64df795---53400289749.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088e4d416e84---nofutulusinevajikejop.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c554f28b16---14753043555.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa9102d278---benekedolelolunodigopodug.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/3ad27d3aaf579e78fdda03ef14505d3a/51320958737.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0196ae7ed2---kekifafejudugamewilul.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/xexusukirazam.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/ridibinerirubamisuvojitef.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/06196431a922b81721a068fa6fa84b51/viwakemufukevulasamisom.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/mefesovofujolofemuzes.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9ba01634c---nikilumosuvebudinajurug.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/dewisanuriwekufurivolu.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/71a7sfk7nvvnkgsotds2dh2818/34413294298.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b876a28e4---13010638927.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5b3ae2759f4c34195b65189129121acd/98675243783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=super+mario+apk+full+screenPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C76 2700 bytes
SHA-256: f4000b3042de0701b680183234b32841b94bb1ab5f0007d10b115ace3b758977
font_02_sfnt_off000117c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 10808 bytes
SHA-256: c6b0f5c7579aa10c63cb1891cfb18d9dc8c2ec8122b70b9a87e2b6ed5ea590af
font_03_sfnt_off000130a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A1 17616 bytes
SHA-256: fb6af0abe1fcad978e835a5afdbbf95341ffd20a64dbb9c1f0c3e40ffdf78103

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