Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7d5ae471fd5f3d…

MALICIOUS

PDF

90.4 KB Created: 2021-08-12 16:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5eb61808919305300d3b13745058ae37 SHA-1: a241c172be86fb763fc1b769df0568339619f1ef SHA-256: 5c7d5ae471fd5f3dc09b94e44a8208843b42bc2469220b7e8d58ea25a4f929d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9513

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://synerhu.ru/uplcv?utm_term=evaluate+expressions+super+teacher+worksheets+answer+key PDF link annotation
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935007b1060---niruridise.pdfIn PDF document text
    • http://hasyo.net/files/file/96748732408.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7495229b429cab26d4c7741a93201d45/waruxotizafetowo.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/36337190311.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/rugevix.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608668de57e85---tamil.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/86060852587.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/86334326866.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///zewufabexat.pdfIn PDF document text
    • http://yuha.be/_files/file/ziwofovizelafozajepakepu.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/nkdgd8h2r657t3v6ejhl7mvm2t/6328630612.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2ecbf311edff131660c67d46e8ec6d96/sukonebesenamenebafovog.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/22932016821.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/rokubomogupotivojaladuxod.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/nhlfm96te831aq5jo266jj7vgm/32900903653.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e5f9487ce---xopaf.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607319e9b4ca0---43030545844.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3dc083fd---1951909330.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed26277fa1---dekojubek.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/bcaee0a414bde45756c6bcdc93f953aa/87638552889.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/89815627585.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/koboxopukurat.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/26177332653.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d2261ee8b---detudefekufoti.pdfIn 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_off000105e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 18388 bytes
SHA-256: dfa5e6cede3860ea9960bf794b1023a7fdea1022fe14ccad0dd27694bea76501
font_01_sfnt_off0001362c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E43 11012 bytes
SHA-256: 716843900f7dbfde08af514f51439e263496c84f9e380e8d3c20fa67d8cdea17

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