Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8539d22302137ca…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 04:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e8152a19ae0fbfed65b3ce352f4a96c SHA-1: e289d3ad8e30bfd959ffc19ba352d107a486b0e4 SHA-256: e8539d22302137cac2808052cd870e0ec054f634be84efc45acab62e6263f8f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=holt+mcdougal+world+history+textbook+pdf+8th+grade PDF link annotation
    • http://campfirewtx.org/userfiles/file/motuzuxab.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/68192563910.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b636aafd7---37116138998.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/9321cd60259a30b10ab7b5b4da49661a/66882489203.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/q1jeomoq87s978j18r544p7091/31295257590.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccde407485---gujilesiderinadivelakixop.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/18205943759.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9f0d96679---55082859716.pdfIn PDF document text
    • http://leeandrewdavison.com/download/90968863873.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/gabow.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/varebevu.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/ludijisozowoxabobudabal.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/likuxeropupelewulekomado.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/vofiroliraru.pdfIn PDF document text
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/62214557593.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/gedemataxujadafem.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dde64653c6e---vedozuvijepap.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/molukisumunepef.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd00a8c63e---8816563157.pdfIn PDF document text
    • http://ezibra.pl/upload//file/zebijiralanosusuzesov.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/20975996894.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/pvfpe5op0rsogbehfpc3vvmi9m/junilepafulo.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///dekorisamigej.pdfIn PDF document text
    • 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_off0000cbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 11796 bytes
SHA-256: 65bad811ab86651019bf9799ad60687c1b4cb81fe4817d3240baedfb091694e6
font_01_sfnt_off0000e7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CC 17272 bytes
SHA-256: 0ddddc34908fa623f850cfe51c9b32cf897b1a7b1b3ccb1c92d8ec4460d44496
font_02_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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