Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e00bba8968e15e6…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 07:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 306cd2f16c90a1d149de2f2ef99410da SHA-1: 18fddd0210f9981d6e38e4d347f8bda9e9b7877a SHA-256: 6e00bba8968e15e685eeea277f46fcf3076588d76ff8ba28311295c27184bbde
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The file's structure and link farm indicate an attempt to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=cardiopulmonary+system+pdf PDF link annotation
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd619a71d3---67811572691.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/zobabewafedan.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16075bbe1089d3---jaxexotewemejawi.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/57079765105.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a7fc27ea3---43803936145.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/mipowuxeluluzivek.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/kedafojifup.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/30105620671.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/kidapotanu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/j0n712psq660hhohdnvcp66nv5/sojawisemoxarozopoposudu.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/fijufororigelu.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2106200227208301260zblszxum3yw.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/kukonanilo.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/fulofemusine.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/38n29t0ho73q7s65o6gdnoj0je/73127658540.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/wilobaxixuben.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/41651861589.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/javedafafu.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-21/20210721045213980186.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/befb5e06bd8d497632f2bd2456f7bb3b/91153291382.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/86723673018.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/43499011632.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878c4d5e795---latibejupojegobojax.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_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 17288 bytes
SHA-256: e865e7021120a5ea907af740a627d569e97590caa375b7bf208ac3bfb69de079
font_01_sfnt_off00010a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 10904 bytes
SHA-256: c2142af389a9ef3a5f25436f5019e501e3b001d6c5bcedf3e79e1ad565111cdd
font_02_sfnt_off000123a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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